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(10j-7)-(9j+2)=0
We simplify the equation to the form, which is simple to understand
(10j-7)-(9j+2)=0
Remove unnecessary parentheses
10j-7-(9j+2)=0
Remove unnecessary parentheses
10j-7-9j-2=0
We move all terms containing j to the left and all other terms to the right.
+10j-9j=0+7+2
We simplify left and right side of the equation.
+1j=+9
We divide both sides of the equation by 1 to get j.
j=9
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