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Simplifying (90 + -1x) * 5 + -1x * 2 = 387 Reorder the terms for easier multiplication: 5(90 + -1x) + -1x * 2 = 387 (90 * 5 + -1x * 5) + -1x * 2 = 387 (450 + -5x) + -1x * 2 = 387 Reorder the terms for easier multiplication: 450 + -5x + -1 * 2x = 387 Multiply -1 * 2 450 + -5x + -2x = 387 Combine like terms: -5x + -2x = -7x 450 + -7x = 387 Solving 450 + -7x = 387 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-450' to each side of the equation. 450 + -450 + -7x = 387 + -450 Combine like terms: 450 + -450 = 0 0 + -7x = 387 + -450 -7x = 387 + -450 Combine like terms: 387 + -450 = -63 -7x = -63 Divide each side by '-7'. x = 9 Simplifying x = 9
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