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Simplifying 7(x + -4) + -4x = -13 Reorder the terms: 7(-4 + x) + -4x = -13 (-4 * 7 + x * 7) + -4x = -13 (-28 + 7x) + -4x = -13 Combine like terms: 7x + -4x = 3x -28 + 3x = -13 Solving -28 + 3x = -13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 3x = -13 + 28 Combine like terms: -28 + 28 = 0 0 + 3x = -13 + 28 3x = -13 + 28 Combine like terms: -13 + 28 = 15 3x = 15 Divide each side by '3'. x = 5 Simplifying x = 5
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