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Simplifying 2x + 2(x + -15) = 278 Reorder the terms: 2x + 2(-15 + x) = 278 2x + (-15 * 2 + x * 2) = 278 2x + (-30 + 2x) = 278 Reorder the terms: -30 + 2x + 2x = 278 Combine like terms: 2x + 2x = 4x -30 + 4x = 278 Solving -30 + 4x = 278 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 + 4x = 278 + 30 Combine like terms: -30 + 30 = 0 0 + 4x = 278 + 30 4x = 278 + 30 Combine like terms: 278 + 30 = 308 4x = 308 Divide each side by '4'. x = 77 Simplifying x = 77
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