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Simplifying 3x + 2(3x + -87) = 21 Reorder the terms: 3x + 2(-87 + 3x) = 21 3x + (-87 * 2 + 3x * 2) = 21 3x + (-174 + 6x) = 21 Reorder the terms: -174 + 3x + 6x = 21 Combine like terms: 3x + 6x = 9x -174 + 9x = 21 Solving -174 + 9x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '174' to each side of the equation. -174 + 174 + 9x = 21 + 174 Combine like terms: -174 + 174 = 0 0 + 9x = 21 + 174 9x = 21 + 174 Combine like terms: 21 + 174 = 195 9x = 195 Divide each side by '9'. x = 21.66666667 Simplifying x = 21.66666667
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