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Simplifying 15x + 21(x + -2) = 246 Reorder the terms: 15x + 21(-2 + x) = 246 15x + (-2 * 21 + x * 21) = 246 15x + (-42 + 21x) = 246 Reorder the terms: -42 + 15x + 21x = 246 Combine like terms: 15x + 21x = 36x -42 + 36x = 246 Solving -42 + 36x = 246 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 = 246 + 42 Combine like terms: -42 + 42 = 0 0 + 36x = 246 + 42 36x = 246 + 42 Combine like terms: 246 + 42 = 288 36x = 288 Divide each side by '36'. x = 8 Simplifying x = 8
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