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Simplifying 3x + 3(5x + -10) = 138 Reorder the terms: 3x + 3(-10 + 5x) = 138 3x + (-10 * 3 + 5x * 3) = 138 3x + (-30 + 15x) = 138 Reorder the terms: -30 + 3x + 15x = 138 Combine like terms: 3x + 15x = 18x -30 + 18x = 138 Solving -30 + 18x = 138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + 18x = 138 + 30 Combine like terms: -30 + 30 = 0 0 + 18x = 138 + 30 18x = 138 + 30 Combine like terms: 138 + 30 = 168 18x = 168 Divide each side by '18'. x = 9.333333333 Simplifying x = 9.333333333
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