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Simplifying 7x + -54 + 8x = 90 Reorder the terms: -54 + 7x + 8x = 90 Combine like terms: 7x + 8x = 15x -54 + 15x = 90 Solving -54 + 15x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '54' to each side of the equation. -54 + 54 + 15x = 90 + 54 Combine like terms: -54 + 54 = 0 0 + 15x = 90 + 54 15x = 90 + 54 Combine like terms: 90 + 54 = 144 15x = 144 Divide each side by '15'. x = 9.6 Simplifying x = 9.6
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