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