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70-4x=30-4x
We move all terms to the left:
70-4x-(30-4x)=0
We add all the numbers together, and all the variables
-4x-(-4x+30)+70=0
We get rid of parentheses
-4x+4x-30+70=0
We add all the numbers together, and all the variables
40!=0
There is no solution for this equation
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