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2.1+2(2.1/5+2)=x
We move all terms to the left:
2.1+2(2.1/5+2)-(x)=0
We add all the numbers together, and all the variables
-1x+2.1+2(2.1/5+2)=0
We multiply parentheses
-1x+2.1+4+2.1/5*2=0
We multiply all the terms by the denominator
-1x*5*2+2.1+(2.1)*5*2+4*5*2=0
We add all the numbers together, and all the variables
-1x*5*2+63.1=0
Wy multiply elements
-10x*2+63.1=0
Wy multiply elements
-20x+63.1=0
We move all terms containing x to the left, all other terms to the right
-20x=-63.1
x=-63.1/-20
x=3+2.8181818181818/18.181818181818
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