5(x+2)=10
8(x-2)=16
5-x=3
15-3x=15
70x+30=100
90x+90x=360+(360+360)
2x-6x=180
2(x+10)=160


1/10+2/17-3/50
1/2-9/17
1/2-(1/10+1/5
1/3*5/80
1/2*(3/5+1/6)
3/9*(1/8-1/10)
2/17:(1/17-1/24)
1/3*(1/27+1/9)