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Simplifying 7 + -4(2x + -1) = 21 Reorder the terms: 7 + -4(-1 + 2x) = 21 7 + (-1 * -4 + 2x * -4) = 21 7 + (4 + -8x) = 21 Combine like terms: 7 + 4 = 11 11 + -8x = 21 Solving 11 + -8x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + -8x = 21 + -11 Combine like terms: 11 + -11 = 0 0 + -8x = 21 + -11 -8x = 21 + -11 Combine like terms: 21 + -11 = 10 -8x = 10 Divide each side by '-8'. x = -1.25 Simplifying x = -1.25
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