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Simplifying 5 + 2(x + -7) = -21 Reorder the terms: 5 + 2(-7 + x) = -21 5 + (-7 * 2 + x * 2) = -21 5 + (-14 + 2x) = -21 Combine like terms: 5 + -14 = -9 -9 + 2x = -21 Solving -9 + 2x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 2x = -21 + 9 Combine like terms: -9 + 9 = 0 0 + 2x = -21 + 9 2x = -21 + 9 Combine like terms: -21 + 9 = -12 2x = -12 Divide each side by '2'. x = -6 Simplifying x = -6
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