Question

прошу помощи ! 3 задания

Answer 1

А..0.4(3-х)-0.7(х+2)=3.1
1.2-0.4х-0.7х-1.4-3.1=0
-1.1х-3.3=0
-1.1х=3.3
х=-3
Б..1.6:х=1 56 : 7 13
1.6:х=14
х=1.6:0.25
х=6.4