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800+25x=1.280-15x
We move all terms to the left:
800+25x-(1.280-15x)=0
We add all the numbers together, and all the variables
25x-(-15x+1.28)+800=0
We get rid of parentheses
25x+15x-1.28+800=0
We add all the numbers together, and all the variables
40x+798.72=0
We move all terms containing x to the left, all other terms to the right
40x=-798.72
x=-798.72/40
x=-19+14.235294117647/14.705882352941
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