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Simplifying 30 + 7a = 28 + -4a Solving 30 + 7a = 28 + -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. 30 + 7a + 4a = 28 + -4a + 4a Combine like terms: 7a + 4a = 11a 30 + 11a = 28 + -4a + 4a Combine like terms: -4a + 4a = 0 30 + 11a = 28 + 0 30 + 11a = 28 Add '-30' to each side of the equation. 30 + -30 + 11a = 28 + -30 Combine like terms: 30 + -30 = 0 0 + 11a = 28 + -30 11a = 28 + -30 Combine like terms: 28 + -30 = -2 11a = -2 Divide each side by '11'. a = -0.1818181818 Simplifying a = -0.1818181818
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