36*(5а+19)=30а+1134
180а+684=30а+1134
180а-30а=1134-684
150а=450
а=450:150
а=3
проверка
36*(5*3+19)=30*3+1134
36*34=90+1134
1224=1224
725t-123<span>t-292=912
602</span><span>t=912+292
602</span><span>t=1204
</span><span>t=1204:602
</span><span>t=2
</span>проверка
725*2-123*2-292=912
1450-246-292=912
912=912
6,4(у-12,8)=3,2
6,4у-81,92=3,2
6,4у=3,2+81,92
6,4у=85,12
у=85,12:6,4
у=13,3
5+2>5+0
5+2>5+1
5+2<5+3
5+2=5+2
5+2<5+15
5+2<5+10