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Simplifying 7 = -9a + 5a Combine like terms: -9a + 5a = -4a 7 = -4a Solving 7 = -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. 7 + 4a = -4a + 4a Combine like terms: -4a + 4a = 0 7 + 4a = 0 Add '-7' to each side of the equation. 7 + -7 + 4a = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 4a = 0 + -7 4a = 0 + -7 Combine like terms: 0 + -7 = -7 4a = -7 Divide each side by '4'. a = -1.75 Simplifying a = -1.75
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