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4x+19=-2x-20
We move all terms to the left:
4x+19-(-2x-20)=0
We get rid of parentheses
4x+2x+20+19=0
We add all the numbers together, and all the variables
6x+39=0
We move all terms containing x to the left, all other terms to the right
6x=-39
x=-39/6
x=-6+1/2
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