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Simplifying 13 + -10x = 91 + -31x Solving 13 + -10x = 91 + -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. 13 + -10x + 31x = 91 + -31x + 31x Combine like terms: -10x + 31x = 21x 13 + 21x = 91 + -31x + 31x Combine like terms: -31x + 31x = 0 13 + 21x = 91 + 0 13 + 21x = 91 Add '-13' to each side of the equation. 13 + -13 + 21x = 91 + -13 Combine like terms: 13 + -13 = 0 0 + 21x = 91 + -13 21x = 91 + -13 Combine like terms: 91 + -13 = 78 21x = 78 Divide each side by '21'. x = 3.714285714 Simplifying x = 3.714285714
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