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21(2-65/42)=12x=
We move all terms to the left:
21(2-65/42)-(12x)=0
We add all the numbers together, and all the variables
-12x+21(-65/42+2)=0
We multiply parentheses
-12x+42-65/42*21=0
We multiply all the terms by the denominator
-12x*42*21-65+42*42*21=0
We add all the numbers together, and all the variables
-12x*42*21+36979=0
Wy multiply elements
-10584x*2+36979=0
Wy multiply elements
-21168x+36979=0
We move all terms containing x to the left, all other terms to the right
-21168x=-36979
x=-36979/-21168
x=1+15811/21168
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