Question

(7.1x+2.2)-(5.5x-9.9x)=1.1

Answer 1

7,1х+2,2-5,5х+9,9х=1,1
11,5х=-1,1
х=-11/115

Answer 2

раскроем скобки : 7.1х+2.2-5.5х+9.9х=1.1
11.5х=-1.1
х=(-1.1)/11.5
х  =-1.1/11.5(дробь)