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Simplifying 87 + -6x = 12x + 21 Reorder the terms: 87 + -6x = 21 + 12x Solving 87 + -6x = 21 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. 87 + -6x + -12x = 21 + 12x + -12x Combine like terms: -6x + -12x = -18x 87 + -18x = 21 + 12x + -12x Combine like terms: 12x + -12x = 0 87 + -18x = 21 + 0 87 + -18x = 21 Add '-87' to each side of the equation. 87 + -87 + -18x = 21 + -87 Combine like terms: 87 + -87 = 0 0 + -18x = 21 + -87 -18x = 21 + -87 Combine like terms: 21 + -87 = -66 -18x = -66 Divide each side by '-18'. x = 3.666666667 Simplifying x = 3.666666667
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