suy ra: \(3\cdot\left(1,5-x\right)=\left|-2,25\right|\)
suy ra; \(3\cdot\left(1,5-x\right)=-2,25\) hoặc \(3\cdot\left(1,5-x\right)=2,25\)
suy ra: \(1,5-x=0,75\)hoặc \(1,5-x=-0,75\)
suy ra: \(x=1,5+0,75\)hoặc \(x=1,5-0,75\)
suy ra \(x=2,25\)hoặc \(x=0,75\)