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Simplifying 2 + -1(2x + 7) = -21 Reorder the terms: 2 + -1(7 + 2x) = -21 2 + (7 * -1 + 2x * -1) = -21 2 + (-7 + -2x) = -21 Combine like terms: 2 + -7 = -5 -5 + -2x = -21 Solving -5 + -2x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -2x = -21 + 5 Combine like terms: -5 + 5 = 0 0 + -2x = -21 + 5 -2x = -21 + 5 Combine like terms: -21 + 5 = -16 -2x = -16 Divide each side by '-2'. x = 8 Simplifying x = 8
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