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