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Simplifying 3x + (x + -7) = 12 Reorder the terms: 3x + (-7 + x) = 12 Remove parenthesis around (-7 + x) 3x + -7 + x = 12 Reorder the terms: -7 + 3x + x = 12 Combine like terms: 3x + x = 4x -7 + 4x = 12 Solving -7 + 4x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 4x = 12 + 7 Combine like terms: -7 + 7 = 0 0 + 4x = 12 + 7 4x = 12 + 7 Combine like terms: 12 + 7 = 19 4x = 19 Divide each side by '4'. x = 4.75 Simplifying x = 4.75
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