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0.45x+0.40(250-x)=103.5
We move all terms to the left:
0.45x+0.40(250-x)-(103.5)=0
We add all the numbers together, and all the variables
0.45x+0.40(-1x+250)-(103.5)=0
We add all the numbers together, and all the variables
0.45x+0.40(-1x+250)-103.5=0
We multiply parentheses
0.45x-0.4x+100-103.5=0
We add all the numbers together, and all the variables
0.05x-3.5=0
We move all terms containing x to the left, all other terms to the right
0.05x=3.5
x=3.5/0.05
x=70
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