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2j-54=-j+21
We simplify the equation to the form, which is simple to understand
2j-54=-j+21
We move all terms containing j to the left and all other terms to the right.
+2j+1j=+21+54
We simplify left and right side of the equation.
+3j=+75
We divide both sides of the equation by 3 to get j.
j=25
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