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40(10+x)=1000
We move all terms to the left:
40(10+x)-(1000)=0
We add all the numbers together, and all the variables
40(x+10)-1000=0
We multiply parentheses
40x+400-1000=0
We add all the numbers together, and all the variables
40x-600=0
We move all terms containing x to the left, all other terms to the right
40x=600
x=600/40
x=15
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