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Simplifying 91 = 7(7 + -1x) + -7 91 = (7 * 7 + -1x * 7) + -7 91 = (49 + -7x) + -7 Reorder the terms: 91 = 49 + -7 + -7x Combine like terms: 49 + -7 = 42 91 = 42 + -7x Solving 91 = 42 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. 91 + 7x = 42 + -7x + 7x Combine like terms: -7x + 7x = 0 91 + 7x = 42 + 0 91 + 7x = 42 Add '-91' to each side of the equation. 91 + -91 + 7x = 42 + -91 Combine like terms: 91 + -91 = 0 0 + 7x = 42 + -91 7x = 42 + -91 Combine like terms: 42 + -91 = -49 7x = -49 Divide each side by '7'. x = -7 Simplifying x = -7
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