1)2х+32=170
2х=170-32
2х=138
х=138/2
х=69
2) 463-4у=219
-4у=219-463
-4у=-244
у=-244/-4
у=61
3) (246+а)-42=643
(246+a)-42=643
246 + a – 42 = 643
a = 643 + 42 – 246
a = 439
1)2х+32=170
2х=170-32
2х=138
х=138/2
х=69
2) 463-4у=219
-4у=219-463
-4у=-244
у=-244/-4
у=61
3) (246+а)-42=643
(246+a)-42=643
246 + a – 42 = 643
a = 643 + 42 – 246
a = 439