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Simplifying 7 + -8a = 4 + -7a Solving 7 + -8a = 4 + -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. 7 + -8a + 7a = 4 + -7a + 7a Combine like terms: -8a + 7a = -1a 7 + -1a = 4 + -7a + 7a Combine like terms: -7a + 7a = 0 7 + -1a = 4 + 0 7 + -1a = 4 Add '-7' to each side of the equation. 7 + -7 + -1a = 4 + -7 Combine like terms: 7 + -7 = 0 0 + -1a = 4 + -7 -1a = 4 + -7 Combine like terms: 4 + -7 = -3 -1a = -3 Divide each side by '-1'. a = 3 Simplifying a = 3
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