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Simplifying 72 + -9a = 68 + -4a Solving 72 + -9a = 68 + -4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4a' to each side of the equation. 72 + -9a + 4a = 68 + -4a + 4a Combine like terms: -9a + 4a = -5a 72 + -5a = 68 + -4a + 4a Combine like terms: -4a + 4a = 0 72 + -5a = 68 + 0 72 + -5a = 68 Add '-72' to each side of the equation. 72 + -72 + -5a = 68 + -72 Combine like terms: 72 + -72 = 0 0 + -5a = 68 + -72 -5a = 68 + -72 Combine like terms: 68 + -72 = -4 -5a = -4 Divide each side by '-5'. a = 0.8 Simplifying a = 0.8
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