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Simplifying -9x + 20 = -7x Reorder the terms: 20 + -9x = -7x Solving 20 + -9x = -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. 20 + -9x + 7x = -7x + 7x Combine like terms: -9x + 7x = -2x 20 + -2x = -7x + 7x Combine like terms: -7x + 7x = 0 20 + -2x = 0 Add '-20' to each side of the equation. 20 + -20 + -2x = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -2x = 0 + -20 -2x = 0 + -20 Combine like terms: 0 + -20 = -20 -2x = -20 Divide each side by '-2'. x = 10 Simplifying x = 10
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