6(x+1.2)=18.6
x+1.2=18.6÷6
x+1.2=3.1
x=3.1-1.2
x=1.9
7(x+1.2)=8.4
x+1.2=8.4÷7
x+1.2=1.2
x=1.2-1.2
x=0