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Simplifying -57 = 7x + -2(5x + 15) Reorder the terms: -57 = 7x + -2(15 + 5x) -57 = 7x + (15 * -2 + 5x * -2) -57 = 7x + (-30 + -10x) Reorder the terms: -57 = -30 + 7x + -10x Combine like terms: 7x + -10x = -3x -57 = -30 + -3x Solving -57 = -30 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. -57 + 3x = -30 + -3x + 3x Combine like terms: -3x + 3x = 0 -57 + 3x = -30 + 0 -57 + 3x = -30 Add '57' to each side of the equation. -57 + 57 + 3x = -30 + 57 Combine like terms: -57 + 57 = 0 0 + 3x = -30 + 57 3x = -30 + 57 Combine like terms: -30 + 57 = 27 3x = 27 Divide each side by '3'. x = 9 Simplifying x = 9
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