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Simplifying 81 + 8x = 87 + 7x Solving 81 + 8x = 87 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 81 + 8x + -7x = 87 + 7x + -7x Combine like terms: 8x + -7x = 1x 81 + 1x = 87 + 7x + -7x Combine like terms: 7x + -7x = 0 81 + 1x = 87 + 0 81 + 1x = 87 Add '-81' to each side of the equation. 81 + -81 + 1x = 87 + -81 Combine like terms: 81 + -81 = 0 0 + 1x = 87 + -81 1x = 87 + -81 Combine like terms: 87 + -81 = 6 1x = 6 Divide each side by '1'. x = 6 Simplifying x = 6
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