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0.3(x+50)-0.02(x-20)=23.8
We move all terms to the left:
0.3(x+50)-0.02(x-20)-(23.8)=0
We add all the numbers together, and all the variables
0.3(x+50)-0.02(x-20)-23.8=0
We multiply parentheses
0.3x-0.02x+15+0.4-23.8=0
We add all the numbers together, and all the variables
0.28x-8.4=0
We move all terms containing x to the left, all other terms to the right
0.28x=8.4
x=8.4/0.28
x=30
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