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30-(20-15x)=10+19x
We move all terms to the left:
30-(20-15x)-(10+19x)=0
We add all the numbers together, and all the variables
-(-15x+20)-(19x+10)+30=0
We get rid of parentheses
15x-19x-20-10+30=0
We add all the numbers together, and all the variables
-4x=0
x=0/-4
x=0
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