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