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0.9x+0.7=02
We move all terms to the left:
0.9x+0.7-(02)=0
We add all the numbers together, and all the variables
0.9x-1.3=0
We move all terms containing x to the left, all other terms to the right
0.9x=1.3
x=1.3/0.9
x=1+0.4/0.9
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