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Simplifying 20x + (-7) = 2x + 21 20x + -7 = 2x + 21 Reorder the terms: -7 + 20x = 2x + 21 Reorder the terms: -7 + 20x = 21 + 2x Solving -7 + 20x = 21 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. -7 + 20x + -2x = 21 + 2x + -2x Combine like terms: 20x + -2x = 18x -7 + 18x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 -7 + 18x = 21 + 0 -7 + 18x = 21 Add '7' to each side of the equation. -7 + 7 + 18x = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 18x = 21 + 7 18x = 21 + 7 Combine like terms: 21 + 7 = 28 18x = 28 Divide each side by '18'. x = 1.555555556 Simplifying x = 1.555555556
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