Question

解方程90.5x+(45-x)*92=91.2*45

Answer 1

90.5x+(45-x)*92=91.2*45
90.5x+45*92-92x=91.2*45
90.5x-92x=91.2*45-45*92
-1.5x=(91.2-92)*45
-1.5x=-0.8*45
x=0.8*30
x=24