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Simplifying 7x + 8x + -12 = 42 Reorder the terms: -12 + 7x + 8x = 42 Combine like terms: 7x + 8x = 15x -12 + 15x = 42 Solving -12 + 15x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 15x = 42 + 12 Combine like terms: -12 + 12 = 0 0 + 15x = 42 + 12 15x = 42 + 12 Combine like terms: 42 + 12 = 54 15x = 54 Divide each side by '15'. x = 3.6 Simplifying x = 3.6
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