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Simplifying -7x + 21(-1x + -18) = -108 Reorder the terms: -7x + 21(-18 + -1x) = -108 -7x + (-18 * 21 + -1x * 21) = -108 -7x + (-378 + -21x) = -108 Reorder the terms: -378 + -7x + -21x = -108 Combine like terms: -7x + -21x = -28x -378 + -28x = -108 Solving -378 + -28x = -108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '378' to each side of the equation. -378 + 378 + -28x = -108 + 378 Combine like terms: -378 + 378 = 0 0 + -28x = -108 + 378 -28x = -108 + 378 Combine like terms: -108 + 378 = 270 -28x = 270 Divide each side by '-28'. x = -9.642857143 Simplifying x = -9.642857143
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