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Simplifying -9 = 5a + 2a Combine like terms: 5a + 2a = 7a -9 = 7a Solving -9 = 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. -9 + -7a = 7a + -7a Combine like terms: 7a + -7a = 0 -9 + -7a = 0 Add '9' to each side of the equation. -9 + 9 + -7a = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -7a = 0 + 9 -7a = 0 + 9 Combine like terms: 0 + 9 = 9 -7a = 9 Divide each side by '-7'. a = -1.285714286 Simplifying a = -1.285714286
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