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Simplifying -2(x + -7) + -21 = -7 Reorder the terms: -2(-7 + x) + -21 = -7 (-7 * -2 + x * -2) + -21 = -7 (14 + -2x) + -21 = -7 Reorder the terms: 14 + -21 + -2x = -7 Combine like terms: 14 + -21 = -7 -7 + -2x = -7 Add '7' to each side of the equation. -7 + 7 + -2x = -7 + 7 Combine like terms: -7 + 7 = 0 0 + -2x = -7 + 7 -2x = -7 + 7 Combine like terms: -7 + 7 = 0 -2x = 0 Solving -2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '-2'. x = 0 Simplifying x = 0
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