помогите решииь 1373 плиз

15,2x+8.3+4.6x+7.5=19.8x+15.8=19.8*0.5+15.8=9.9+15.8=25.7
19.8y-12.6y+4.37+31y=38.2y+4.37=38.2*2.1+4.37=84.59
(6.5x-2.7x)+(13.4x-5.2x)=3.8x+8.2x=12x=12*0.7=8.4