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Simplifying -123 = -2x + 3(6x + 7) Reorder the terms: -123 = -2x + 3(7 + 6x) -123 = -2x + (7 * 3 + 6x * 3) -123 = -2x + (21 + 18x) Reorder the terms: -123 = 21 + -2x + 18x Combine like terms: -2x + 18x = 16x -123 = 21 + 16x Solving -123 = 21 + 16x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-16x' to each side of the equation. -123 + -16x = 21 + 16x + -16x Combine like terms: 16x + -16x = 0 -123 + -16x = 21 + 0 -123 + -16x = 21 Add '123' to each side of the equation. -123 + 123 + -16x = 21 + 123 Combine like terms: -123 + 123 = 0 0 + -16x = 21 + 123 -16x = 21 + 123 Combine like terms: 21 + 123 = 144 -16x = 144 Divide each side by '-16'. x = -9 Simplifying x = -9
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