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40+40x+(2*40x)+3(40x)+4(40x)=440
We move all terms to the left:
40+40x+(2*40x)+3(40x)+4(40x)-(440)=0
We add all the numbers together, and all the variables
40x+(+2*40x)+340x+440x+40-440=0
We add all the numbers together, and all the variables
820x+(+2*40x)-400=0
We get rid of parentheses
820x+2*40x-400=0
Wy multiply elements
820x+80x-400=0
We add all the numbers together, and all the variables
900x-400=0
We move all terms containing x to the left, all other terms to the right
900x=400
x=400/900
x=4/9
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