<span>1) (x+6y)-(8x-7y)=x+6y-8x-7y=9х+13у</span>
<span><span> 2) (m+3)-(6m+5)-(m-1)=m+3-6m-5-m+1=-6m-1</span></span>
<span><span>3) (0.2x-3)-(x-2)-(0.4x-1)=0.2x-3-x+2-0.4x+1=-1,2х</span></span>
7:5=1ост2 Сносим 2, 22:5=4ост2 Сносим 6, 26:5=5ост.1=145ост.1