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Simplifying 90 + -6a = 15a Solving 90 + -6a = 15a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15a' to each side of the equation. 90 + -6a + -15a = 15a + -15a Combine like terms: -6a + -15a = -21a 90 + -21a = 15a + -15a Combine like terms: 15a + -15a = 0 90 + -21a = 0 Add '-90' to each side of the equation. 90 + -90 + -21a = 0 + -90 Combine like terms: 90 + -90 = 0 0 + -21a = 0 + -90 -21a = 0 + -90 Combine like terms: 0 + -90 = -90 -21a = -90 Divide each side by '-21'. a = 4.285714286 Simplifying a = 4.285714286
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