Помогите 1)10х+3х=52 2)18х-11х =63 3)4х+5х+23=104

Question

Помогите 1)10х+3х=52 2)18х-11х =63 3)4х+5х+23=104

Answer 1

10 + 13 =13  52 : 13 =4

Answer 2

10х+3х = 52
13х = 52
х = 52/13
х = 4

18х-11х=63
7х = 63
х = 63/7 
х = 9
4х+5х+23=104
9х=104-23
9х=81
х/81/9
х=9