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Simplifying 12 + -10x = 138 + -31x Solving 12 + -10x = 138 + -31x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '31x' to each side of the equation. 12 + -10x + 31x = 138 + -31x + 31x Combine like terms: -10x + 31x = 21x 12 + 21x = 138 + -31x + 31x Combine like terms: -31x + 31x = 0 12 + 21x = 138 + 0 12 + 21x = 138 Add '-12' to each side of the equation. 12 + -12 + 21x = 138 + -12 Combine like terms: 12 + -12 = 0 0 + 21x = 138 + -12 21x = 138 + -12 Combine like terms: 138 + -12 = 126 21x = 126 Divide each side by '21'. x = 6 Simplifying x = 6
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