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Simplifying -4 + 7x + 6x = 87 Combine like terms: 7x + 6x = 13x -4 + 13x = 87 Solving -4 + 13x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 13x = 87 + 4 Combine like terms: -4 + 4 = 0 0 + 13x = 87 + 4 13x = 87 + 4 Combine like terms: 87 + 4 = 91 13x = 91 Divide each side by '13'. x = 7 Simplifying x = 7
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