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0.05x+0.075(2000-x)=135
We move all terms to the left:
0.05x+0.075(2000-x)-(135)=0
We add all the numbers together, and all the variables
0.05x+0.075(-1x+2000)-135=0
We multiply parentheses
0.05x-0.075x+150-135=0
We add all the numbers together, and all the variables
-0.025x+15=0
We move all terms containing x to the left, all other terms to the right
-0.025x=-15
x=-15/-0.025
x=+600
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