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Simplifying 3a + -7a + -9 = 40 Reorder the terms: -9 + 3a + -7a = 40 Combine like terms: 3a + -7a = -4a -9 + -4a = 40 Solving -9 + -4a = 40 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -4a = 40 + 9 Combine like terms: -9 + 9 = 0 0 + -4a = 40 + 9 -4a = 40 + 9 Combine like terms: 40 + 9 = 49 -4a = 49 Divide each side by '-4'. a = -12.25 Simplifying a = -12.25
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