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Simplifying 3(a + -7) = 18 Reorder the terms: 3(-7 + a) = 18 (-7 * 3 + a * 3) = 18 (-21 + 3a) = 18 Solving -21 + 3a = 18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 3a = 18 + 21 Combine like terms: -21 + 21 = 0 0 + 3a = 18 + 21 3a = 18 + 21 Combine like terms: 18 + 21 = 39 3a = 39 Divide each side by '3'. a = 13 Simplifying a = 13
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