Решите уравнения 3/7х=9, 5х-15=0, 2/5х+4=0, 1/2х-1/3=1/6, 17,5х-0,5=34,5, 0,81х-71=1,11х+1, 1/3у-4=1/4-

3/7х=9, х=9 : 3/7 = 9*7/3=3*7=21;
2/5х+4=0,2/5х=-4, х=-4 : 2/5 = -4*5/2=-2/5=-10;
1/2х=1/6+1/3=1/6+2/6=3/6=1/2, х=1;
17,5х=34,5+0,5=35, х=2;
0,81х=1+71=72, х=88ц 8/9 (или 88,(8));
1/3у=1/4-5+4=1/4-1=1/4-4/4=-3/4, у = -3/4 :1/3 = -3/4 * 3/1=-9/4 = -2ц 1/4 (или -2,25)