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Simplifying 7x + -1(4x + -9) = 30 Reorder the terms: 7x + -1(-9 + 4x) = 30 7x + (-9 * -1 + 4x * -1) = 30 7x + (9 + -4x) = 30 Reorder the terms: 9 + 7x + -4x = 30 Combine like terms: 7x + -4x = 3x 9 + 3x = 30 Solving 9 + 3x = 30 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 3x = 30 + -9 Combine like terms: 9 + -9 = 0 0 + 3x = 30 + -9 3x = 30 + -9 Combine like terms: 30 + -9 = 21 3x = 21 Divide each side by '3'. x = 7 Simplifying x = 7
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