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Simplifying -7 + -10 = 20 + -3a Combine like terms: -7 + -10 = -17 -17 = 20 + -3a Solving -17 = 20 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. -17 + 3a = 20 + -3a + 3a Combine like terms: -3a + 3a = 0 -17 + 3a = 20 + 0 -17 + 3a = 20 Add '17' to each side of the equation. -17 + 17 + 3a = 20 + 17 Combine like terms: -17 + 17 = 0 0 + 3a = 20 + 17 3a = 20 + 17 Combine like terms: 20 + 17 = 37 3a = 37 Divide each side by '3'. a = 12.33333333 Simplifying a = 12.33333333
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