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Simplifying 123 = 6x + -3(-4x + 7) Reorder the terms: 123 = 6x + -3(7 + -4x) 123 = 6x + (7 * -3 + -4x * -3) 123 = 6x + (-21 + 12x) Reorder the terms: 123 = -21 + 6x + 12x Combine like terms: 6x + 12x = 18x 123 = -21 + 18x Solving 123 = -21 + 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 = -21 + 18x + -18x Combine like terms: 18x + -18x = 0 123 + -18x = -21 + 0 123 + -18x = -21 Add '-123' to each side of the equation. 123 + -123 + -18x = -21 + -123 Combine like terms: 123 + -123 = 0 0 + -18x = -21 + -123 -18x = -21 + -123 Combine like terms: -21 + -123 = -144 -18x = -144 Divide each side by '-18'. x = 8 Simplifying x = 8
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