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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 = -3 -3 + -8x = 21 Solving -3 + -8x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -8x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + -8x = 21 + 3 -8x = 21 + 3 Combine like terms: 21 + 3 = 24 -8x = 24 Divide each side by '-8'. x = -3 Simplifying x = -3
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