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x-15=0.30x+5
We move all terms to the left:
x-15-(0.30x+5)=0
We get rid of parentheses
x-0.30x-5-15=0
We add all the numbers together, and all the variables
0.7x-20=0
We move all terms containing x to the left, all other terms to the right
0.7x=20
x=20/0.7
x=28+0.4/0.7
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