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40x+10(1.5x)=900
We move all terms to the left:
40x+10(1.5x)-(900)=0
We add all the numbers together, and all the variables
40x+10(+1.5x)-900=0
We multiply parentheses
40x+10x-900=0
We add all the numbers together, and all the variables
50x-900=0
We move all terms containing x to the left, all other terms to the right
50x=900
x=900/50
x=18
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