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6/2.5x=21
We move all terms to the left:
6/2.5x-(21)=0
Domain of the equation: 2.5x!=0We multiply all the terms by the denominator
x!=0/2.5
x!=0
x∈R
-21*2.5x+6=0
Wy multiply elements
-42x+6=0
We move all terms containing x to the left, all other terms to the right
-42x=-6
x=-6/-42
x=1/7
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