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-3(5+x)=75
We move all terms to the left:
-3(5+x)-(75)=0
We add all the numbers together, and all the variables
-3(x+5)-75=0
We multiply parentheses
-3x-15-75=0
We add all the numbers together, and all the variables
-3x-90=0
We move all terms containing x to the left, all other terms to the right
-3x=90
x=90/-3
x=-30
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