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7-2/5x=21
We move all terms to the left:
7-2/5x-(21)=0
Domain of the equation: 5x!=0We add all the numbers together, and all the variables
x!=0/5
x!=0
x∈R
-2/5x-14=0
We multiply all the terms by the denominator
-14*5x-2=0
Wy multiply elements
-70x-2=0
We move all terms containing x to the left, all other terms to the right
-70x=2
x=2/-70
x=-1/35
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