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Simplifying 5a + -7(a + 10) = -56 Reorder the terms: 5a + -7(10 + a) = -56 5a + (10 * -7 + a * -7) = -56 5a + (-70 + -7a) = -56 Reorder the terms: -70 + 5a + -7a = -56 Combine like terms: 5a + -7a = -2a -70 + -2a = -56 Solving -70 + -2a = -56 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '70' to each side of the equation. -70 + 70 + -2a = -56 + 70 Combine like terms: -70 + 70 = 0 0 + -2a = -56 + 70 -2a = -56 + 70 Combine like terms: -56 + 70 = 14 -2a = 14 Divide each side by '-2'. a = -7 Simplifying a = -7
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