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Simplifying -13 = -3x + 8 + -4x Reorder the terms: -13 = 8 + -3x + -4x Combine like terms: -3x + -4x = -7x -13 = 8 + -7x Solving -13 = 8 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. -13 + 7x = 8 + -7x + 7x Combine like terms: -7x + 7x = 0 -13 + 7x = 8 + 0 -13 + 7x = 8 Add '13' to each side of the equation. -13 + 13 + 7x = 8 + 13 Combine like terms: -13 + 13 = 0 0 + 7x = 8 + 13 7x = 8 + 13 Combine like terms: 8 + 13 = 21 7x = 21 Divide each side by '7'. x = 3 Simplifying x = 3
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