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Simplifying 3x + -4(3x + 18) = -126 Reorder the terms: 3x + -4(18 + 3x) = -126 3x + (18 * -4 + 3x * -4) = -126 3x + (-72 + -12x) = -126 Reorder the terms: -72 + 3x + -12x = -126 Combine like terms: 3x + -12x = -9x -72 + -9x = -126 Solving -72 + -9x = -126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '72' to each side of the equation. -72 + 72 + -9x = -126 + 72 Combine like terms: -72 + 72 = 0 0 + -9x = -126 + 72 -9x = -126 + 72 Combine like terms: -126 + 72 = -54 -9x = -54 Divide each side by '-9'. x = 6 Simplifying x = 6
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