## Elementary Algebra

In order to follow order of operations, we first multiply and then we add and subtract: $7(0.6)+0.9-3(0.4)+0.4$ =$(7\times0.6)+0.9-(3\times0.4)+0.4$ =$(4.2)+0.9-(1.2)+0.4$ =$(4.2+0.9)-1.2+0.4$ =$(5.1)-1.2+0.4$ =$(5.1-1.2)+0.4$ =$(3.9)+0.4$ =$4.3$