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Simplifying 123 = -7x + 5(5x + -15) Reorder the terms: 123 = -7x + 5(-15 + 5x) 123 = -7x + (-15 * 5 + 5x * 5) 123 = -7x + (-75 + 25x) Reorder the terms: 123 = -75 + -7x + 25x Combine like terms: -7x + 25x = 18x 123 = -75 + 18x Solving 123 = -75 + 18x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18x' to each side of the equation. 123 + -18x = -75 + 18x + -18x Combine like terms: 18x + -18x = 0 123 + -18x = -75 + 0 123 + -18x = -75 Add '-123' to each side of the equation. 123 + -123 + -18x = -75 + -123 Combine like terms: 123 + -123 = 0 0 + -18x = -75 + -123 -18x = -75 + -123 Combine like terms: -75 + -123 = -198 -18x = -198 Divide each side by '-18'. x = 11 Simplifying x = 11
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