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0.3x+0.4x=253
We move all terms to the left:
0.3x+0.4x-(253)=0
We add all the numbers together, and all the variables
0.7x-253=0
We move all terms containing x to the left, all other terms to the right
0.7x=253
x=253/0.7
x=361+0.3/0.7
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