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0.5x+0.45(70)=39.5
We move all terms to the left:
0.5x+0.45(70)-(39.5)=0
We add all the numbers together, and all the variables
0.5x-39.043=0
We move all terms containing x to the left, all other terms to the right
0.5x=39.043
x=39.043/0.5
x=78+0.043/0.5
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