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0.05(x+50)-0.03(9x-40)=2.9
We move all terms to the left:
0.05(x+50)-0.03(9x-40)-(2.9)=0
We add all the numbers together, and all the variables
0.05(x+50)-0.03(9x-40)-2.9=0
We multiply parentheses
0.05x-0.27x+2.5+1.2-2.9=0
We add all the numbers together, and all the variables
-0.22x+0.8=0
We move all terms containing x to the left, all other terms to the right
-0.22x=-0.8
x=-0.8/-0.22
x=3+0.14/0.22
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