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Simplifying x + 7x + -30 = 90 Reorder the terms: -30 + x + 7x = 90 Combine like terms: x + 7x = 8x -30 + 8x = 90 Solving -30 + 8x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + 8x = 90 + 30 Combine like terms: -30 + 30 = 0 0 + 8x = 90 + 30 8x = 90 + 30 Combine like terms: 90 + 30 = 120 8x = 120 Divide each side by '8'. x = 15 Simplifying x = 15
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