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6(b-30)=400
We move all terms to the left:
6(b-30)-(400)=0
We multiply parentheses
6b-180-400=0
We add all the numbers together, and all the variables
6b-580=0
We move all terms containing b to the left, all other terms to the right
6b=580
b=580/6
b=96+2/3
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