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1.3+0.8x=0.5
We move all terms to the left:
1.3+0.8x-(0.5)=0
We add all the numbers together, and all the variables
0.8x+0.8=0
We move all terms containing x to the left, all other terms to the right
0.8x=-0.8
x=-0.8/0.8
x=-1
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