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Simplifying 144 + -7x = 20x + 21 Reorder the terms: 144 + -7x = 21 + 20x Solving 144 + -7x = 21 + 20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20x' to each side of the equation. 144 + -7x + -20x = 21 + 20x + -20x Combine like terms: -7x + -20x = -27x 144 + -27x = 21 + 20x + -20x Combine like terms: 20x + -20x = 0 144 + -27x = 21 + 0 144 + -27x = 21 Add '-144' to each side of the equation. 144 + -144 + -27x = 21 + -144 Combine like terms: 144 + -144 = 0 0 + -27x = 21 + -144 -27x = 21 + -144 Combine like terms: 21 + -144 = -123 -27x = -123 Divide each side by '-27'. x = 4.555555556 Simplifying x = 4.555555556
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