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Simplifying 4 = -7a + 9a Combine like terms: -7a + 9a = 2a 4 = 2a Solving 4 = 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 4 + -2a = 2a + -2a Combine like terms: 2a + -2a = 0 4 + -2a = 0 Add '-4' to each side of the equation. 4 + -4 + -2a = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -2a = 0 + -4 -2a = 0 + -4 Combine like terms: 0 + -4 = -4 -2a = -4 Divide each side by '-2'. a = 2 Simplifying a = 2
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