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Simplifying 90 = 13a + -7 Reorder the terms: 90 = -7 + 13a Solving 90 = -7 + 13a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-13a' to each side of the equation. 90 + -13a = -7 + 13a + -13a Combine like terms: 13a + -13a = 0 90 + -13a = -7 + 0 90 + -13a = -7 Add '-90' to each side of the equation. 90 + -90 + -13a = -7 + -90 Combine like terms: 90 + -90 = 0 0 + -13a = -7 + -90 -13a = -7 + -90 Combine like terms: -7 + -90 = -97 -13a = -97 Divide each side by '-13'. a = 7.461538462 Simplifying a = 7.461538462
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