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30-5x=x(-)
We move all terms to the left:
30-5x-(x(-))=0
We add all the numbers together, and all the variables
-5x-(x0)+30=0
We add all the numbers together, and all the variables
-6x+30=0
We move all terms containing x to the left, all other terms to the right
-6x=-30
x=-30/-6
x=+5
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