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Simplifying 87 = -5(4a + -7x) + 7 87 = (4a * -5 + -7x * -5) + 7 87 = (-20a + 35x) + 7 Reorder the terms: 87 = 7 + -20a + 35x Solving 87 = 7 + -20a + 35x Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '20a' to each side of the equation. 87 + 20a = 7 + -20a + 20a + 35x Combine like terms: -20a + 20a = 0 87 + 20a = 7 + 0 + 35x 87 + 20a = 7 + 35x Add '-87' to each side of the equation. 87 + -87 + 20a = 7 + -87 + 35x Combine like terms: 87 + -87 = 0 0 + 20a = 7 + -87 + 35x 20a = 7 + -87 + 35x Combine like terms: 7 + -87 = -80 20a = -80 + 35x Divide each side by '20'. a = -4 + 1.75x Simplifying a = -4 + 1.75x
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