4x(x-5.07)+x=8.63
4x-20.28+x=8.63
5x=8.63+20.28
5x=28.91
x=5.782
18-4x=2x+3
2x+4x=18-3
6x=15
x=2.5
(2x-4)*3=(x+5)*4
6x-12=4x+20
6x-4x=12+20
2x=32
x=16