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Simplifying 7x + -4(1 + -6x) = -221 7x + (1 * -4 + -6x * -4) = -221 7x + (-4 + 24x) = -221 Reorder the terms: -4 + 7x + 24x = -221 Combine like terms: 7x + 24x = 31x -4 + 31x = -221 Solving -4 + 31x = -221 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 31x = -221 + 4 Combine like terms: -4 + 4 = 0 0 + 31x = -221 + 4 31x = -221 + 4 Combine like terms: -221 + 4 = -217 31x = -217 Divide each side by '31'. x = -7 Simplifying x = -7
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