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Simplifying 5 + -2(a + 15) = 90 Reorder the terms: 5 + -2(15 + a) = 90 5 + (15 * -2 + a * -2) = 90 5 + (-30 + -2a) = 90 Combine like terms: 5 + -30 = -25 -25 + -2a = 90 Solving -25 + -2a = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + -2a = 90 + 25 Combine like terms: -25 + 25 = 0 0 + -2a = 90 + 25 -2a = 90 + 25 Combine like terms: 90 + 25 = 115 -2a = 115 Divide each side by '-2'. a = -57.5 Simplifying a = -57.5
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