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Simplifying 87 + -4x = 7x + 21 Reorder the terms: 87 + -4x = 21 + 7x Solving 87 + -4x = 21 + 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 + -4x + -7x = 21 + 7x + -7x Combine like terms: -4x + -7x = -11x 87 + -11x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 87 + -11x = 21 + 0 87 + -11x = 21 Add '-87' to each side of the equation. 87 + -87 + -11x = 21 + -87 Combine like terms: 87 + -87 = 0 0 + -11x = 21 + -87 -11x = 21 + -87 Combine like terms: 21 + -87 = -66 -11x = -66 Divide each side by '-11'. x = 6 Simplifying x = 6
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