1) X-13=195-41
X-13=154
X=154+13
X=167
2)141+X=119+37
141+X=156
X=156-141
X=15
3) 41+X=123-23
41+X=100
X=100-41
X=59
4) 127+X=418+236
127+X=654
X=654-127
X=527
5) y-246=300-154
Y-246=146
Y=146+246
Y=392
6)492-a=245+87
492-a=332
A=492-332
A=160
7)B-358=745-455
B-358=295
B=358+295
B=653
8)543-X=304-266
543-X=38
X=543-38
X=505
9)X+162=789-519
X+162=270
X=270-162
X=108