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Simplifying 7 + a + -3a = 5 + -4a Combine like terms: a + -3a = -2a 7 + -2a = 5 + -4a Solving 7 + -2a = 5 + -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 + -2a + 4a = 5 + -4a + 4a Combine like terms: -2a + 4a = 2a 7 + 2a = 5 + -4a + 4a Combine like terms: -4a + 4a = 0 7 + 2a = 5 + 0 7 + 2a = 5 Add '-7' to each side of the equation. 7 + -7 + 2a = 5 + -7 Combine like terms: 7 + -7 = 0 0 + 2a = 5 + -7 2a = 5 + -7 Combine like terms: 5 + -7 = -2 2a = -2 Divide each side by '2'. a = -1 Simplifying a = -1
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