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25+x=0.2*9
We move all terms to the left:
25+x-(0.2*9)=0
We add all the numbers together, and all the variables
x+25-(1.8)=0
We add all the numbers together, and all the variables
x+23.2=0
We move all terms containing x to the left, all other terms to the right
x=-23.2
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