Question

5y+3(7y+18)=106 с проверкой

Answer 1

5y+3(7y+18)=106
5y+21y+54=106
26y=52
y=52:26
y=2
5•2+21•2+54=106

Answer 2

5y+3(7y+18)=106
5y×7y+3×7y+5y×18+3×18 = 35y+3×7y+5y×18+54 = 106
35y+3×7y+5y×18 = 106-54 = 52
35y+21y+90y=52
146y=52
y=52:146
y=0,35616438...