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Simplifying 7 + -1(2x + 8) = 21 Reorder the terms: 7 + -1(8 + 2x) = 21 7 + (8 * -1 + 2x * -1) = 21 7 + (-8 + -2x) = 21 Combine like terms: 7 + -8 = -1 -1 + -2x = 21 Solving -1 + -2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -2x = 21 + 1 Combine like terms: -1 + 1 = 0 0 + -2x = 21 + 1 -2x = 21 + 1 Combine like terms: 21 + 1 = 22 -2x = 22 Divide each side by '-2'. x = -11 Simplifying x = -11
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