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Simplifying 7x + -87 + 2x + 6 = 90 Reorder the terms: -87 + 6 + 7x + 2x = 90 Combine like terms: -87 + 6 = -81 -81 + 7x + 2x = 90 Combine like terms: 7x + 2x = 9x -81 + 9x = 90 Solving -81 + 9x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '81' to each side of the equation. -81 + 81 + 9x = 90 + 81 Combine like terms: -81 + 81 = 0 0 + 9x = 90 + 81 9x = 90 + 81 Combine like terms: 90 + 81 = 171 9x = 171 Divide each side by '9'. x = 19 Simplifying x = 19
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