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Simplifying 87 + -4x = 2x + 21 Reorder the terms: 87 + -4x = 21 + 2x Solving 87 + -4x = 21 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 87 + -4x + -2x = 21 + 2x + -2x Combine like terms: -4x + -2x = -6x 87 + -6x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 87 + -6x = 21 + 0 87 + -6x = 21 Add '-87' to each side of the equation. 87 + -87 + -6x = 21 + -87 Combine like terms: 87 + -87 = 0 0 + -6x = 21 + -87 -6x = 21 + -87 Combine like terms: 21 + -87 = -66 -6x = -66 Divide each side by '-6'. x = 11 Simplifying x = 11
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