Найдите значение выражения:
1) 3(a+2b)-a при a+3b=1.1;
2) 2.4(3x+5y)-4y при 0.9x+y=2
3) 8(0.5a+3b)+8a при a+2b=2.5
4) 3(0.6m+5n)-3n при 0.3m+2n=4

Помогите пойжалуста! Буду рад.
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