1) 8у-345=455
8у=455+345
8у=800|:8
у=100
2)630:(150-х)=70
(150-х)= 630:70
150-х=9
х=150-9
х=141
3)35+(b+165)=658
(b+165)=658-35
b+165=623
b=623-165
b=458
4) 400•(x-5)=10.000
(x-5)=10.000:400
x-5=0.025
x=0.025+5
x=5.025
1) 8у-345=455
8у=455+345
8у=800|:8
у=100
2)630:(150-х)=70
(150-х)= 630:70
150-х=9
х=150-9
х=141
3)35+(b+165)=658
(b+165)=658-35
b+165=623
b=623-165
b=458
4) 400•(x-5)=10.000
(x-5)=10.000:400
x-5=0.025
x=0.025+5
x=5.025