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4(10+x)=90
We move all terms to the left:
4(10+x)-(90)=0
We add all the numbers together, and all the variables
4(x+10)-90=0
We multiply parentheses
4x+40-90=0
We add all the numbers together, and all the variables
4x-50=0
We move all terms containing x to the left, all other terms to the right
4x=50
x=50/4
x=12+1/2
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