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0.30(x+10)+0.50x=19
We move all terms to the left:
0.30(x+10)+0.50x-(19)=0
We add all the numbers together, and all the variables
0.50x+0.30(x+10)-19=0
We multiply parentheses
0.50x+0.3x+3-19=0
We add all the numbers together, and all the variables
0.8x-16=0
We move all terms containing x to the left, all other terms to the right
0.8x=16
x=16/0.8
x=20
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