A) 30a+3a+96=690
30a+3a=690-96
33a=594
a=594/33
а=18
b) 27x-4x+70=599
27x-4x=599-70
23x=529
x=529/23
х=23
c) 29y+y-10=890
29y+y=890+10
30у=900
у=900/30
у=30
d) 825+10x+5x=675
10x+5x=675-825
15x=-150
x=-150/15
х=-10
A) 30a+3a+96=690
30a+3a=690-96
33a=594
a=594/33
а=18
b) 27x-4x+70=599
27x-4x=599-70
23x=529
x=529/23
х=23
c) 29y+y-10=890
29y+y=890+10
30у=900
у=900/30
у=30
d) 825+10x+5x=675
10x+5x=675-825
15x=-150
x=-150/15
х=-10