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x/90+3x=0.4
We move all terms to the left:
x/90+3x-(0.4)=0
We add all the numbers together, and all the variables
3x+x/90-0.4=0
We multiply all the terms by the denominator
3x*90+x-(0.4)*90=0
We add all the numbers together, and all the variables
x+3x*90-36=0
Wy multiply elements
x+270x-36=0
We add all the numbers together, and all the variables
271x-36=0
We move all terms containing x to the left, all other terms to the right
271x=36
x=36/271
x=36/271
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