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Simplifying 21x + -30x + -7 = 20 Reorder the terms: -7 + 21x + -30x = 20 Combine like terms: 21x + -30x = -9x -7 + -9x = 20 Solving -7 + -9x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -9x = 20 + 7 Combine like terms: -7 + 7 = 0 0 + -9x = 20 + 7 -9x = 20 + 7 Combine like terms: 20 + 7 = 27 -9x = 27 Divide each side by '-9'. x = -3 Simplifying x = -3
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