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-4(450+x)=90
We move all terms to the left:
-4(450+x)-(90)=0
We add all the numbers together, and all the variables
-4(x+450)-90=0
We multiply parentheses
-4x-1800-90=0
We add all the numbers together, and all the variables
-4x-1890=0
We move all terms containing x to the left, all other terms to the right
-4x=1890
x=1890/-4
x=-472+1/2
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