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Simplifying 3x + 87 = 7x + 81 Reorder the terms: 87 + 3x = 7x + 81 Reorder the terms: 87 + 3x = 81 + 7x Solving 87 + 3x = 81 + 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. 87 + 3x + -7x = 81 + 7x + -7x Combine like terms: 3x + -7x = -4x 87 + -4x = 81 + 7x + -7x Combine like terms: 7x + -7x = 0 87 + -4x = 81 + 0 87 + -4x = 81 Add '-87' to each side of the equation. 87 + -87 + -4x = 81 + -87 Combine like terms: 87 + -87 = 0 0 + -4x = 81 + -87 -4x = 81 + -87 Combine like terms: 81 + -87 = -6 -4x = -6 Divide each side by '-4'. x = 1.5 Simplifying x = 1.5
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