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Simplifying 231 + -3x = 42x + 21 Reorder the terms: 231 + -3x = 21 + 42x Solving 231 + -3x = 21 + 42x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42x' to each side of the equation. 231 + -3x + -42x = 21 + 42x + -42x Combine like terms: -3x + -42x = -45x 231 + -45x = 21 + 42x + -42x Combine like terms: 42x + -42x = 0 231 + -45x = 21 + 0 231 + -45x = 21 Add '-231' to each side of the equation. 231 + -231 + -45x = 21 + -231 Combine like terms: 231 + -231 = 0 0 + -45x = 21 + -231 -45x = 21 + -231 Combine like terms: 21 + -231 = -210 -45x = -210 Divide each side by '-45'. x = 4.666666667 Simplifying x = 4.666666667
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