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Simplifying 21 + -1(2x + 17) = -7 + -3 Reorder the terms: 21 + -1(17 + 2x) = -7 + -3 21 + (17 * -1 + 2x * -1) = -7 + -3 21 + (-17 + -2x) = -7 + -3 Combine like terms: 21 + -17 = 4 4 + -2x = -7 + -3 Combine like terms: -7 + -3 = -10 4 + -2x = -10 Solving 4 + -2x = -10 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -2x = -10 + -4 Combine like terms: 4 + -4 = 0 0 + -2x = -10 + -4 -2x = -10 + -4 Combine like terms: -10 + -4 = -14 -2x = -14 Divide each side by '-2'. x = 7 Simplifying x = 7
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