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-6x+3(-7x+20)=150
We move all terms to the left:
-6x+3(-7x+20)-(150)=0
We multiply parentheses
-6x-21x+60-150=0
We add all the numbers together, and all the variables
-27x-90=0
We move all terms containing x to the left, all other terms to the right
-27x=90
x=90/-27
x=-3+1/3
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