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Simplifying -1 = 3(x + -4) + -1(x + -7) Reorder the terms: -1 = 3(-4 + x) + -1(x + -7) -1 = (-4 * 3 + x * 3) + -1(x + -7) -1 = (-12 + 3x) + -1(x + -7) Reorder the terms: -1 = -12 + 3x + -1(-7 + x) -1 = -12 + 3x + (-7 * -1 + x * -1) -1 = -12 + 3x + (7 + -1x) Reorder the terms: -1 = -12 + 7 + 3x + -1x Combine like terms: -12 + 7 = -5 -1 = -5 + 3x + -1x Combine like terms: 3x + -1x = 2x -1 = -5 + 2x Solving -1 = -5 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. -1 + -2x = -5 + 2x + -2x Combine like terms: 2x + -2x = 0 -1 + -2x = -5 + 0 -1 + -2x = -5 Add '1' to each side of the equation. -1 + 1 + -2x = -5 + 1 Combine like terms: -1 + 1 = 0 0 + -2x = -5 + 1 -2x = -5 + 1 Combine like terms: -5 + 1 = -4 -2x = -4 Divide each side by '-2'. x = 2 Simplifying x = 2
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