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5(-7x+3)=-300
We move all terms to the left:
5(-7x+3)-(-300)=0
We add all the numbers together, and all the variables
5(-7x+3)+300=0
We multiply parentheses
-35x+15+300=0
We add all the numbers together, and all the variables
-35x+315=0
We move all terms containing x to the left, all other terms to the right
-35x=-315
x=-315/-35
x=+9
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