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Simplifying 500 + -30a + 150 = 20 Reorder the terms: 500 + 150 + -30a = 20 Combine like terms: 500 + 150 = 650 650 + -30a = 20 Solving 650 + -30a = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-650' to each side of the equation. 650 + -650 + -30a = 20 + -650 Combine like terms: 650 + -650 = 0 0 + -30a = 20 + -650 -30a = 20 + -650 Combine like terms: 20 + -650 = -630 -30a = -630 Divide each side by '-30'. a = 21 Simplifying a = 21
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