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Simplifying 9x + -1(7x + -4) = 20 Reorder the terms: 9x + -1(-4 + 7x) = 20 9x + (-4 * -1 + 7x * -1) = 20 9x + (4 + -7x) = 20 Reorder the terms: 4 + 9x + -7x = 20 Combine like terms: 9x + -7x = 2x 4 + 2x = 20 Solving 4 + 2x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 2x = 20 + -4 Combine like terms: 4 + -4 = 0 0 + 2x = 20 + -4 2x = 20 + -4 Combine like terms: 20 + -4 = 16 2x = 16 Divide each side by '2'. x = 8 Simplifying x = 8
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