13/14 (у+65)+84 17/21 (у-4,2)+(96 5/27у +1/189у
(13/14=0,9) (84 17/21=84,8)
1. 0,9×(у+65)=0,9у+58,5
2. 84,8×(у-4,2)= 84,8у -356,16
3. (96 5/27у+1/189у)= 96 2/27у+1/189у=
= 2/27у+7/189у=
=96 9/189у=96 1/21у=96,05у (1/21=0,05)
4. 58,5+84,8у - 356,16+96,05у=
=180,85у - 297,66
5. 180,85у = 297,66
у= 297,66: 180,85
у= 1.65