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Simplifying 4x + (5x + -7) = 20 Reorder the terms: 4x + (-7 + 5x) = 20 Remove parenthesis around (-7 + 5x) 4x + -7 + 5x = 20 Reorder the terms: -7 + 4x + 5x = 20 Combine like terms: 4x + 5x = 9x -7 + 9x = 20 Solving -7 + 9x = 20 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 + 9x = 20 + 7 Combine like terms: -7 + 7 = 0 0 + 9x = 20 + 7 9x = 20 + 7 Combine like terms: 20 + 7 = 27 9x = 27 Divide each side by '9'. x = 3 Simplifying x = 3
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