@vaxab23111 Тоже решил поучавствовать на разминки мозга, на 100% не претендует
function getCooficient(exp) { var matched = exp.match(/(\d+)[\s*+-/]*[A-z]/) if (matched) { return parseFloat(matched.pop()) } return 1 } function evalSide(exp) { var cleanExp = exp.replace(/\d*[\s*+-/]*[A-z]/, '') if (!cleanExp) return 0 return eval(cleanExp) } function invertResult(num) { return num > 0? -num : num } function solveEquation(equation) { var parts = equation.split("=") var leftSide = parts[0].trim() var rightSide = parts[1].trim() var coefficient = 1 var leftSideResult = evalSide(leftSide) var rightSideResult = evalSide(rightSide) if (/[A-z]/.test(leftSide)) { var coefficient = getCooficient(leftSide) leftSideResult = invertResult(leftSideResult) } else { var coefficient = getCooficient(rightSide) rightSideResult = invertResult(rightSideResult) } return (leftSideResult + rightSideResult) / coefficient } log(solveEquation("6 * X=14")); // выводит 2.3333333333333335 log(solveEquation("X+2=80")); // выводит 78 log(solveEquation("12+15=X")); // выводит 27 log(solveEquation("6 *X + 2=14")); // выводит 2 log(solveEquation("X+2 * 2=80")); // выводит 76 log(solveEquation("12+15/5=X")); // выводит 15 [[BAS_VARIABLE]] = solveEquation("6 * X=14")
