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Simplifying 20 = -10(x + 7) Reorder the terms: 20 = -10(7 + x) 20 = (7 * -10 + x * -10) 20 = (-70 + -10x) Solving 20 = -70 + -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. 20 + 10x = -70 + -10x + 10x Combine like terms: -10x + 10x = 0 20 + 10x = -70 + 0 20 + 10x = -70 Add '-20' to each side of the equation. 20 + -20 + 10x = -70 + -20 Combine like terms: 20 + -20 = 0 0 + 10x = -70 + -20 10x = -70 + -20 Combine like terms: -70 + -20 = -90 10x = -90 Divide each side by '10'. x = -9 Simplifying x = -9
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