12x<span>=10*(100-x)+18.8
22x</span><span>=1188
x</span><span>=1188/22
x</span><span>=54</span>
Х- 3/4 Х= 4/4 Х-3/4 Х=1/4 Х ////////////////
8ц1/17-(х+2ц3/17)=3ц9/17+15/17; (17*8+1)/17 -[х+(17*2+3)/17]=(17*3+9)/17+15/17; 137/17-[х+37/17]=60/17+15/17; 137/17-х-37/17=(60+15)/17; (137-37)/17 -х=75/17; 100/17-х=75/17; 100/17-75/17=х; (100-75)/17=х; 25/17=х; Х=1ц8/17;.ток 1 :3