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Simplifying 7x + -7(-2x + -9) = 189 Reorder the terms: 7x + -7(-9 + -2x) = 189 7x + (-9 * -7 + -2x * -7) = 189 7x + (63 + 14x) = 189 Reorder the terms: 63 + 7x + 14x = 189 Combine like terms: 7x + 14x = 21x 63 + 21x = 189 Solving 63 + 21x = 189 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + 21x = 189 + -63 Combine like terms: 63 + -63 = 0 0 + 21x = 189 + -63 21x = 189 + -63 Combine like terms: 189 + -63 = 126 21x = 126 Divide each side by '21'. x = 6 Simplifying x = 6
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