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Simplifying 15x + 21(x + -2) = 138 Reorder the terms: 15x + 21(-2 + x) = 138 15x + (-2 * 21 + x * 21) = 138 15x + (-42 + 21x) = 138 Reorder the terms: -42 + 15x + 21x = 138 Combine like terms: 15x + 21x = 36x -42 + 36x = 138 Solving -42 + 36x = 138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '42' to each side of the equation. -42 + 42 + 36x = 138 + 42 Combine like terms: -42 + 42 = 0 0 + 36x = 138 + 42 36x = 138 + 42 Combine like terms: 138 + 42 = 180 36x = 180 Divide each side by '36'. x = 5 Simplifying x = 5
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