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0.05(x+10)-0.09(x-30)=2
We move all terms to the left:
0.05(x+10)-0.09(x-30)-(2)=0
We multiply parentheses
0.05x-0.09x+0.5+2.7-2=0
We add all the numbers together, and all the variables
-0.04x+1.2=0
We move all terms containing x to the left, all other terms to the right
-0.04x=-1.2
x=-1.2/-0.04
x=+30
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