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Simplifying 90 = -2(5x + -8) + 4 Reorder the terms: 90 = -2(-8 + 5x) + 4 90 = (-8 * -2 + 5x * -2) + 4 90 = (16 + -10x) + 4 Reorder the terms: 90 = 16 + 4 + -10x Combine like terms: 16 + 4 = 20 90 = 20 + -10x Solving 90 = 20 + -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. 90 + 10x = 20 + -10x + 10x Combine like terms: -10x + 10x = 0 90 + 10x = 20 + 0 90 + 10x = 20 Add '-90' to each side of the equation. 90 + -90 + 10x = 20 + -90 Combine like terms: 90 + -90 = 0 0 + 10x = 20 + -90 10x = 20 + -90 Combine like terms: 20 + -90 = -70 10x = -70 Divide each side by '10'. x = -7 Simplifying x = -7
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