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Simplifying -2x + 7(-1x + 21) = 75 Reorder the terms: -2x + 7(21 + -1x) = 75 -2x + (21 * 7 + -1x * 7) = 75 -2x + (147 + -7x) = 75 Reorder the terms: 147 + -2x + -7x = 75 Combine like terms: -2x + -7x = -9x 147 + -9x = 75 Solving 147 + -9x = 75 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-147' to each side of the equation. 147 + -147 + -9x = 75 + -147 Combine like terms: 147 + -147 = 0 0 + -9x = 75 + -147 -9x = 75 + -147 Combine like terms: 75 + -147 = -72 -9x = -72 Divide each side by '-9'. x = 8 Simplifying x = 8
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