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12j-9j=7
We simplify the equation to the form, which is simple to understand
12j-9j=7
We move all terms containing j to the left and all other terms to the right.
+12j-9j=+7
We simplify left and right side of the equation.
+3j=+7
We divide both sides of the equation by 3 to get j.
j=2.33333333333
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