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x+7.5+0.3x=-5.8
We move all terms to the left:
x+7.5+0.3x-(-5.8)=0
We add all the numbers together, and all the variables
1.3x+13.3=0
We move all terms containing x to the left, all other terms to the right
1.3x=-13.3
x=-13.3/1.3
x=-10+0.3/1.3
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