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10+0.8x=0.3x-5
We move all terms to the left:
10+0.8x-(0.3x-5)=0
We get rid of parentheses
0.8x-0.3x+5+10=0
We add all the numbers together, and all the variables
0.5x+15=0
We move all terms containing x to the left, all other terms to the right
0.5x=-15
x=-15/0.5
x=-30
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