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Simplifying 3a + 7a + 7 = 121 Reorder the terms: 7 + 3a + 7a = 121 Combine like terms: 3a + 7a = 10a 7 + 10a = 121 Solving 7 + 10a = 121 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 10a = 121 + -7 Combine like terms: 7 + -7 = 0 0 + 10a = 121 + -7 10a = 121 + -7 Combine like terms: 121 + -7 = 114 10a = 114 Divide each side by '10'. a = 11.4 Simplifying a = 11.4
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