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Simplifying 3x + -7(-4x + -13) = -126 Reorder the terms: 3x + -7(-13 + -4x) = -126 3x + (-13 * -7 + -4x * -7) = -126 3x + (91 + 28x) = -126 Reorder the terms: 91 + 3x + 28x = -126 Combine like terms: 3x + 28x = 31x 91 + 31x = -126 Solving 91 + 31x = -126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-91' to each side of the equation. 91 + -91 + 31x = -126 + -91 Combine like terms: 91 + -91 = 0 0 + 31x = -126 + -91 31x = -126 + -91 Combine like terms: -126 + -91 = -217 31x = -217 Divide each side by '31'. x = -7 Simplifying x = -7
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