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Simplifying 1.8(1.5 + a) = -7.2 (1.5 * 1.8 + a * 1.8) = -7.2 (2.7 + 1.8a) = -7.2 Solving 2.7 + 1.8a = -7.2 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2.7' to each side of the equation. 2.7 + -2.7 + 1.8a = -7.2 + -2.7 Combine like terms: 2.7 + -2.7 = 0.0 0.0 + 1.8a = -7.2 + -2.7 1.8a = -7.2 + -2.7 Combine like terms: -7.2 + -2.7 = -9.9 1.8a = -9.9 Divide each side by '1.8'. a = -5.5 Simplifying a = -5.5
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