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Simplifying 3(x + -4) + -7x = 13 + x Reorder the terms: 3(-4 + x) + -7x = 13 + x (-4 * 3 + x * 3) + -7x = 13 + x (-12 + 3x) + -7x = 13 + x Combine like terms: 3x + -7x = -4x -12 + -4x = 13 + x Solving -12 + -4x = 13 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -12 + -4x + -1x = 13 + x + -1x Combine like terms: -4x + -1x = -5x -12 + -5x = 13 + x + -1x Combine like terms: x + -1x = 0 -12 + -5x = 13 + 0 -12 + -5x = 13 Add '12' to each side of the equation. -12 + 12 + -5x = 13 + 12 Combine like terms: -12 + 12 = 0 0 + -5x = 13 + 12 -5x = 13 + 12 Combine like terms: 13 + 12 = 25 -5x = 25 Divide each side by '-5'. x = -5 Simplifying x = -5
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