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Simplifying 42 = 7(x + -13) Reorder the terms: 42 = 7(-13 + x) 42 = (-13 * 7 + x * 7) 42 = (-91 + 7x) Solving 42 = -91 + 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. 42 + -7x = -91 + 7x + -7x Combine like terms: 7x + -7x = 0 42 + -7x = -91 + 0 42 + -7x = -91 Add '-42' to each side of the equation. 42 + -42 + -7x = -91 + -42 Combine like terms: 42 + -42 = 0 0 + -7x = -91 + -42 -7x = -91 + -42 Combine like terms: -91 + -42 = -133 -7x = -133 Divide each side by '-7'. x = 19 Simplifying x = 19
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