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4x+4/5=2.1/5
We move all terms to the left:
4x+4/5-(2.1/5)=0
We add all the numbers together, and all the variables
4x+4/5-(+2.1/5)=0
We get rid of parentheses
4x+4/5-2.1/5=0
We multiply all the terms by the denominator
4x*5+4-2.1=0
We add all the numbers together, and all the variables
4x*5+1.9=0
Wy multiply elements
20x+1.9=0
We move all terms containing x to the left, all other terms to the right
20x=-1.9
x=-1.9/20
x=-1/10.526315789474
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