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Simplifying 12 + -9x = 7x + 21 Reorder the terms: 12 + -9x = 21 + 7x Solving 12 + -9x = 21 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 12 + -9x + -7x = 21 + 7x + -7x Combine like terms: -9x + -7x = -16x 12 + -16x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 12 + -16x = 21 + 0 12 + -16x = 21 Add '-12' to each side of the equation. 12 + -12 + -16x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + -16x = 21 + -12 -16x = 21 + -12 Combine like terms: 21 + -12 = 9 -16x = 9 Divide each side by '-16'. x = -0.5625 Simplifying x = -0.5625
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