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Simplifying -18 + -4a = 30 Solving -18 + -4a = 30 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + -4a = 30 + 18 Combine like terms: -18 + 18 = 0 0 + -4a = 30 + 18 -4a = 30 + 18 Combine like terms: 30 + 18 = 48 -4a = 48 Divide each side by '-4'. a = -12 Simplifying a = -12
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