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Simplifying x + x + 10 + x + -12 = 400 Reorder the terms: 10 + -12 + x + x + x = 400 Combine like terms: 10 + -12 = -2 -2 + x + x + x = 400 Combine like terms: x + x = 2x -2 + 2x + x = 400 Combine like terms: 2x + x = 3x -2 + 3x = 400 Solving -2 + 3x = 400 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 3x = 400 + 2 Combine like terms: -2 + 2 = 0 0 + 3x = 400 + 2 3x = 400 + 2 Combine like terms: 400 + 2 = 402 3x = 402 Divide each side by '3'. x = 134 Simplifying x = 134
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