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Simplifying -7x + 7(-3x + 17) = -21 Reorder the terms: -7x + 7(17 + -3x) = -21 -7x + (17 * 7 + -3x * 7) = -21 -7x + (119 + -21x) = -21 Reorder the terms: 119 + -7x + -21x = -21 Combine like terms: -7x + -21x = -28x 119 + -28x = -21 Solving 119 + -28x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-119' to each side of the equation. 119 + -119 + -28x = -21 + -119 Combine like terms: 119 + -119 = 0 0 + -28x = -21 + -119 -28x = -21 + -119 Combine like terms: -21 + -119 = -140 -28x = -140 Divide each side by '-28'. x = 5 Simplifying x = 5
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