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Simplifying 7 + 13 = -4(7x + -5) Combine like terms: 7 + 13 = 20 20 = -4(7x + -5) Reorder the terms: 20 = -4(-5 + 7x) 20 = (-5 * -4 + 7x * -4) 20 = (20 + -28x) Add '-20' to each side of the equation. 20 + -20 = 20 + -20 + -28x Combine like terms: 20 + -20 = 0 0 = 20 + -20 + -28x Combine like terms: 20 + -20 = 0 0 = 0 + -28x 0 = -28x Solving 0 = -28x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28x' to each side of the equation. 0 + 28x = -28x + 28x Remove the zero: 28x = -28x + 28x Combine like terms: -28x + 28x = 0 28x = 0 Divide each side by '28'. x = 0 Simplifying x = 0
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