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Simplifying 12 + -10x = 87 + -31x Solving 12 + -10x = 87 + -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 = 87 + -31x + 31x Combine like terms: -10x + 31x = 21x 12 + 21x = 87 + -31x + 31x Combine like terms: -31x + 31x = 0 12 + 21x = 87 + 0 12 + 21x = 87 Add '-12' to each side of the equation. 12 + -12 + 21x = 87 + -12 Combine like terms: 12 + -12 = 0 0 + 21x = 87 + -12 21x = 87 + -12 Combine like terms: 87 + -12 = 75 21x = 75 Divide each side by '21'. x = 3.571428571 Simplifying x = 3.571428571
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