Решите уравнения a) 9.5x-(3.2x+1.8x)+3.75=6.9 б) 11.3y-(9.7y-0.8y)+7.4=17 по действиям

А) 9.5x-(3.2x+1.8x)+3.75=6.9 
    9.5x-5x+3.75=6.9
    4.5x+3.75=6.9
    4.5x=6.9-3.75
    4.5x=3.75
    x=0.7
б) 11.3y-(9.7y-0.8y)+7.4=17
     11.3y-8.9y+7.4=17
      2.4y+7.4=17
      2.4y=17-7.4
      2.4y=9.6
      y=4

9.5х-(3.2х+1.8х)+3.75=6.9
9.5х-5х+3.75=6.9
4.5х+3.75=6.9
4.5х=6.9-3.75
4.5х=3.15
х=3.15:4.5
х=0.7

11.3у-(9.7у-0.8у)+7.4=17
11.3у-8.9у+7.4=17
2.4у+7.4=17
2.4у=17-7.4
2.4у=9.6
у=9.6:2.4
у=4