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Simplifying 7x + -15 = 10x + -42 Reorder the terms: -15 + 7x = 10x + -42 Reorder the terms: -15 + 7x = -42 + 10x Solving -15 + 7x = -42 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. -15 + 7x + -10x = -42 + 10x + -10x Combine like terms: 7x + -10x = -3x -15 + -3x = -42 + 10x + -10x Combine like terms: 10x + -10x = 0 -15 + -3x = -42 + 0 -15 + -3x = -42 Add '15' to each side of the equation. -15 + 15 + -3x = -42 + 15 Combine like terms: -15 + 15 = 0 0 + -3x = -42 + 15 -3x = -42 + 15 Combine like terms: -42 + 15 = -27 -3x = -27 Divide each side by '-3'. x = 9 Simplifying x = 9
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