5x+4(2x-14)+12×140/50=5(2x-14)+4x
5x+8x-56+33.6=8x-70+4x
13x-22.4=12x-70
13x-12x=22.4-70
x= -47.6貌似做错了，验算一下吧5x+4(2x-14)+12×140/50=5(2x-14)+4x5x+8x-56+33.6=10x-70+4x13x-22.4=14x-7013x-14x=22.4-70x= 47.6