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Simplifying 87 = 64 + x Solving 87 = 64 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 87 + -1x = 64 + x + -1x Combine like terms: x + -1x = 0 87 + -1x = 64 + 0 87 + -1x = 64 Add '-87' to each side of the equation. 87 + -87 + -1x = 64 + -87 Combine like terms: 87 + -87 = 0 0 + -1x = 64 + -87 -1x = 64 + -87 Combine like terms: 64 + -87 = -23 -1x = -23 Divide each side by '-1'. x = 23 Simplifying x = 23
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