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Simplifying 91 = 7(1 + -4x) 91 = (1 * 7 + -4x * 7) 91 = (7 + -28x) Solving 91 = 7 + -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. 91 + 28x = 7 + -28x + 28x Combine like terms: -28x + 28x = 0 91 + 28x = 7 + 0 91 + 28x = 7 Add '-91' to each side of the equation. 91 + -91 + 28x = 7 + -91 Combine like terms: 91 + -91 = 0 0 + 28x = 7 + -91 28x = 7 + -91 Combine like terms: 7 + -91 = -84 28x = -84 Divide each side by '28'. x = -3 Simplifying x = -3
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