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0.4x+1.7x=2.15x-1.1
We move all terms to the left:
0.4x+1.7x-(2.15x-1.1)=0
We add all the numbers together, and all the variables
2.1x-(2.15x-1.1)=0
We get rid of parentheses
2.1x-2.15x+1.1=0
We add all the numbers together, and all the variables
-0.05x+1.1=0
We move all terms containing x to the left, all other terms to the right
-0.05x=-1.1
x=-1.1/-0.05
x=+22
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