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