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Simplifying 3x + (x + -1) + 3x + (x + -1) = 30 Reorder the terms: 3x + (-1 + x) + 3x + (x + -1) = 30 Remove parenthesis around (-1 + x) 3x + -1 + x + 3x + (x + -1) = 30 Reorder the terms: 3x + -1 + x + 3x + (-1 + x) = 30 Remove parenthesis around (-1 + x) 3x + -1 + x + 3x + -1 + x = 30 Reorder the terms: -1 + -1 + 3x + x + 3x + x = 30 Combine like terms: -1 + -1 = -2 -2 + 3x + x + 3x + x = 30 Combine like terms: 3x + x = 4x -2 + 4x + 3x + x = 30 Combine like terms: 4x + 3x = 7x -2 + 7x + x = 30 Combine like terms: 7x + x = 8x -2 + 8x = 30 Solving -2 + 8x = 30 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 + 8x = 30 + 2 Combine like terms: -2 + 2 = 0 0 + 8x = 30 + 2 8x = 30 + 2 Combine like terms: 30 + 2 = 32 8x = 32 Divide each side by '8'. x = 4 Simplifying x = 4
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