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-13+4x=-39+25x
We move all terms to the left:
-13+4x-(-39+25x)=0
We add all the numbers together, and all the variables
4x-(25x-39)-13=0
We get rid of parentheses
4x-25x+39-13=0
We add all the numbers together, and all the variables
-21x+26=0
We move all terms containing x to the left, all other terms to the right
-21x=-26
x=-26/-21
x=1+5/21
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