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Simplifying 7 + -7a = 40 + -28a Solving 7 + -7a = 40 + -28a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '28a' to each side of the equation. 7 + -7a + 28a = 40 + -28a + 28a Combine like terms: -7a + 28a = 21a 7 + 21a = 40 + -28a + 28a Combine like terms: -28a + 28a = 0 7 + 21a = 40 + 0 7 + 21a = 40 Add '-7' to each side of the equation. 7 + -7 + 21a = 40 + -7 Combine like terms: 7 + -7 = 0 0 + 21a = 40 + -7 21a = 40 + -7 Combine like terms: 40 + -7 = 33 21a = 33 Divide each side by '21'. a = 1.571428571 Simplifying a = 1.571428571
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