32х-59=453; 32х=453+59; 32х=512; х=512:32; х=16
У:23+312=390; у:23=390-312; у:23=78; у=78·23; у=1794
7035:(120-х)=67; 120-х=7035:67; 120-х=105; х=120-105; х=15
(74см+16см)-40см=90см-40см=50см=5дм
9(3х-7)+3(8х-11)=3(9х+8),
27х-63+24х-33=27х+24,
-63+24х-33=24,
-96+24х=24,
24х=24+96,
24х=120,
х=5.
Ответ: 5.
6(7х-11)-13(х-6)=14(2х+1),
42х-66-13х+78=28х+14,
29х+12=28х+14,
29х-28х=14-12,
х=2.
Ответ: 2.