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Simplifying 7 = a + -11 + a Reorder the terms: 7 = -11 + a + a Combine like terms: a + a = 2a 7 = -11 + 2a Solving 7 = -11 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 7 + -2a = -11 + 2a + -2a Combine like terms: 2a + -2a = 0 7 + -2a = -11 + 0 7 + -2a = -11 Add '-7' to each side of the equation. 7 + -7 + -2a = -11 + -7 Combine like terms: 7 + -7 = 0 0 + -2a = -11 + -7 -2a = -11 + -7 Combine like terms: -11 + -7 = -18 -2a = -18 Divide each side by '-2'. a = 9 Simplifying a = 9
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