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Simplifying 126 = 7(x + -7) Reorder the terms: 126 = 7(-7 + x) 126 = (-7 * 7 + x * 7) 126 = (-49 + 7x) Solving 126 = -49 + 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. 126 + -7x = -49 + 7x + -7x Combine like terms: 7x + -7x = 0 126 + -7x = -49 + 0 126 + -7x = -49 Add '-126' to each side of the equation. 126 + -126 + -7x = -49 + -126 Combine like terms: 126 + -126 = 0 0 + -7x = -49 + -126 -7x = -49 + -126 Combine like terms: -49 + -126 = -175 -7x = -175 Divide each side by '-7'. x = 25 Simplifying x = 25
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