4x÷(1-65%)=80 120%x-x=0.8 49+40%x=89
6x+15+6=141 15x+6x=168 12(x+3.7)=144 4.2×3+3x=15.3
① ②
x÷0.2=7.2 △2x-3.42=6.4
138-x=57 4x+6x=18
*5x+2.4=12.4 0.8x-0.2x=4.8 4x-9×1.2=1.2
12(x-0.6)=36
6x-1.2+0.5=4.112-5x=7.5