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3/4*90=x
We move all terms to the left:
3/4*90-(x)=0
We add all the numbers together, and all the variables
-1x+3/4*90=0
We multiply all the terms by the denominator
-1x*4*90+3=0
Wy multiply elements
-360x*9+3=0
Wy multiply elements
-3240x+3=0
We move all terms containing x to the left, all other terms to the right
-3240x=-3
x=-3/-3240
x=1/1080
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