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Simplifying 27 + -7a = 28 + -4a Solving 27 + -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. 27 + -7a + 4a = 28 + -4a + 4a Combine like terms: -7a + 4a = -3a 27 + -3a = 28 + -4a + 4a Combine like terms: -4a + 4a = 0 27 + -3a = 28 + 0 27 + -3a = 28 Add '-27' to each side of the equation. 27 + -27 + -3a = 28 + -27 Combine like terms: 27 + -27 = 0 0 + -3a = 28 + -27 -3a = 28 + -27 Combine like terms: 28 + -27 = 1 -3a = 1 Divide each side by '-3'. a = -0.3333333333 Simplifying a = -0.3333333333
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