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Simplifying 70 + 0.80a = 30 + 90a Solving 70 + 0.80a = 30 + 90a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-90a' to each side of the equation. 70 + 0.80a + -90a = 30 + 90a + -90a Combine like terms: 0.80a + -90a = -89.2a 70 + -89.2a = 30 + 90a + -90a Combine like terms: 90a + -90a = 0 70 + -89.2a = 30 + 0 70 + -89.2a = 30 Add '-70' to each side of the equation. 70 + -70 + -89.2a = 30 + -70 Combine like terms: 70 + -70 = 0 0 + -89.2a = 30 + -70 -89.2a = 30 + -70 Combine like terms: 30 + -70 = -40 -89.2a = -40 Divide each side by '-89.2'. a = 0.4484304933 Simplifying a = 0.4484304933
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