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Simplifying 3(x + -4) + 3x + 2(x + 4) = 280 Reorder the terms: 3(-4 + x) + 3x + 2(x + 4) = 280 (-4 * 3 + x * 3) + 3x + 2(x + 4) = 280 (-12 + 3x) + 3x + 2(x + 4) = 280 Reorder the terms: -12 + 3x + 3x + 2(4 + x) = 280 -12 + 3x + 3x + (4 * 2 + x * 2) = 280 -12 + 3x + 3x + (8 + 2x) = 280 Reorder the terms: -12 + 8 + 3x + 3x + 2x = 280 Combine like terms: -12 + 8 = -4 -4 + 3x + 3x + 2x = 280 Combine like terms: 3x + 3x = 6x -4 + 6x + 2x = 280 Combine like terms: 6x + 2x = 8x -4 + 8x = 280 Solving -4 + 8x = 280 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 8x = 280 + 4 Combine like terms: -4 + 4 = 0 0 + 8x = 280 + 4 8x = 280 + 4 Combine like terms: 280 + 4 = 284 8x = 284 Divide each side by '8'. x = 35.5 Simplifying x = 35.5
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