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Simplifying 7x + -5(x + -4) = -20 Reorder the terms: 7x + -5(-4 + x) = -20 7x + (-4 * -5 + x * -5) = -20 7x + (20 + -5x) = -20 Reorder the terms: 20 + 7x + -5x = -20 Combine like terms: 7x + -5x = 2x 20 + 2x = -20 Solving 20 + 2x = -20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 2x = -20 + -20 Combine like terms: 20 + -20 = 0 0 + 2x = -20 + -20 2x = -20 + -20 Combine like terms: -20 + -20 = -40 2x = -40 Divide each side by '2'. x = -20 Simplifying x = -20
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