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4x+x=45-20
5x=25
x=25/5
x=5
6(x+5)=18
6x+30=18
6x=18-30
6x= -12
x= -12/6
x= -2
5x-2x+4=4x-3x+6
3x-x=6-4
2x=2
x=2/2
x=1
4x+x=45-20
5x=25
x=5
6(x+5)=18
6x+30=18
6x=-12
x=-2
5x-2x+4=4x-3x+6
3x+4=x+6
3x-2x=6-4
x=2