x+0.25x=12.5
8.4-3x= 2.7
☆2x+0.6=1.08
①6.3+x=10.7
②4(x+2.5)=10.4
③3x+2.4x=10.8
④3.82+1.5x=6.1
⑤8.7x-2x=6.03
⑥(6.4+2x)÷6=4.8