7-3х=4х-9, 6а-1=3а+7 , 10y-3=5+3y
7-3x=4x-9 -3x-4x=-9-7 -7x=-16 7x=16 x= x= 6a-1=3a+7 6a-3a=7+1 3a=8 a= a= 10y-3=5+3y 10y-3y=5+3 7y=8 y= y=