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10(9+x)=4x-100
We move all terms to the left:
10(9+x)-(4x-100)=0
We add all the numbers together, and all the variables
10(x+9)-(4x-100)=0
We multiply parentheses
10x-(4x-100)+90=0
We get rid of parentheses
10x-4x+100+90=0
We add all the numbers together, and all the variables
6x+190=0
We move all terms containing x to the left, all other terms to the right
6x=-190
x=-190/6
x=-31+2/3
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