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Simplifying 7(15 + -1a) = 56 (15 * 7 + -1a * 7) = 56 (105 + -7a) = 56 Solving 105 + -7a = 56 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-105' to each side of the equation. 105 + -105 + -7a = 56 + -105 Combine like terms: 105 + -105 = 0 0 + -7a = 56 + -105 -7a = 56 + -105 Combine like terms: 56 + -105 = -49 -7a = -49 Divide each side by '-7'. a = 7 Simplifying a = 7
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