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Simplifying -7 + 3(1 + -4x) = -4x + -20 -7 + (1 * 3 + -4x * 3) = -4x + -20 -7 + (3 + -12x) = -4x + -20 Combine like terms: -7 + 3 = -4 -4 + -12x = -4x + -20 Reorder the terms: -4 + -12x = -20 + -4x Solving -4 + -12x = -20 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. -4 + -12x + 4x = -20 + -4x + 4x Combine like terms: -12x + 4x = -8x -4 + -8x = -20 + -4x + 4x Combine like terms: -4x + 4x = 0 -4 + -8x = -20 + 0 -4 + -8x = -20 Add '4' to each side of the equation. -4 + 4 + -8x = -20 + 4 Combine like terms: -4 + 4 = 0 0 + -8x = -20 + 4 -8x = -20 + 4 Combine like terms: -20 + 4 = -16 -8x = -16 Divide each side by '-8'. x = 2 Simplifying x = 2
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