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Simplifying 126 = 3 + 3(6x + -7) Reorder the terms: 126 = 3 + 3(-7 + 6x) 126 = 3 + (-7 * 3 + 6x * 3) 126 = 3 + (-21 + 18x) Combine like terms: 3 + -21 = -18 126 = -18 + 18x Solving 126 = -18 + 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. 126 + -18x = -18 + 18x + -18x Combine like terms: 18x + -18x = 0 126 + -18x = -18 + 0 126 + -18x = -18 Add '-126' to each side of the equation. 126 + -126 + -18x = -18 + -126 Combine like terms: 126 + -126 = 0 0 + -18x = -18 + -126 -18x = -18 + -126 Combine like terms: -18 + -126 = -144 -18x = -144 Divide each side by '-18'. x = 8 Simplifying x = 8
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