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9/b-4=12/5
We simplify the equation to the form, which is simple to understand
9/b-4=12/5
We move all terms containing b to the left and all other terms to the right.
+1b=+2.4+4
We simplify left and right side of the equation.
+1b=+6.4
We divide both sides of the equation by 1 to get b.
b=6.4
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