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Simplifying 7x + -1(2x + -3) = 9x + 12 Reorder the terms: 7x + -1(-3 + 2x) = 9x + 12 7x + (-3 * -1 + 2x * -1) = 9x + 12 7x + (3 + -2x) = 9x + 12 Reorder the terms: 3 + 7x + -2x = 9x + 12 Combine like terms: 7x + -2x = 5x 3 + 5x = 9x + 12 Reorder the terms: 3 + 5x = 12 + 9x Solving 3 + 5x = 12 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 3 + 5x + -9x = 12 + 9x + -9x Combine like terms: 5x + -9x = -4x 3 + -4x = 12 + 9x + -9x Combine like terms: 9x + -9x = 0 3 + -4x = 12 + 0 3 + -4x = 12 Add '-3' to each side of the equation. 3 + -3 + -4x = 12 + -3 Combine like terms: 3 + -3 = 0 0 + -4x = 12 + -3 -4x = 12 + -3 Combine like terms: 12 + -3 = 9 -4x = 9 Divide each side by '-4'. x = -2.25 Simplifying x = -2.25
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