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Simplifying 15 + -4a + 20 = 7 Reorder the terms: 15 + 20 + -4a = 7 Combine like terms: 15 + 20 = 35 35 + -4a = 7 Solving 35 + -4a = 7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-35' to each side of the equation. 35 + -35 + -4a = 7 + -35 Combine like terms: 35 + -35 = 0 0 + -4a = 7 + -35 -4a = 7 + -35 Combine like terms: 7 + -35 = -28 -4a = -28 Divide each side by '-4'. a = 7 Simplifying a = 7
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