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Simplifying 7x + 7(4x + 20) = 0 Reorder the terms: 7x + 7(20 + 4x) = 0 7x + (20 * 7 + 4x * 7) = 0 7x + (140 + 28x) = 0 Reorder the terms: 140 + 7x + 28x = 0 Combine like terms: 7x + 28x = 35x 140 + 35x = 0 Solving 140 + 35x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-140' to each side of the equation. 140 + -140 + 35x = 0 + -140 Combine like terms: 140 + -140 = 0 0 + 35x = 0 + -140 35x = 0 + -140 Combine like terms: 0 + -140 = -140 35x = -140 Divide each side by '35'. x = -4 Simplifying x = -4
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