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Simplifying 87 + (a + 7) = 3a Reorder the terms: 87 + (7 + a) = 3a Remove parenthesis around (7 + a) 87 + 7 + a = 3a Combine like terms: 87 + 7 = 94 94 + a = 3a Solving 94 + a = 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 94 + a + -3a = 3a + -3a Combine like terms: a + -3a = -2a 94 + -2a = 3a + -3a Combine like terms: 3a + -3a = 0 94 + -2a = 0 Add '-94' to each side of the equation. 94 + -94 + -2a = 0 + -94 Combine like terms: 94 + -94 = 0 0 + -2a = 0 + -94 -2a = 0 + -94 Combine like terms: 0 + -94 = -94 -2a = -94 Divide each side by '-2'. a = 47 Simplifying a = 47
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