Помогите срочно плиз!!!!!!! 79+(89-n)=103 2)9z+3z-13=155

Question

Помогите срочно плиз!!!!!!!
79+(89-n)=103
2)9z+3z-13=155

Answer 1

79+(89-n)=103
79+89-n=103
168-n=103
n=168-103
n=65
9z+3z-13=155
12z=155+13
12z=168
z=168:12
z=14

Answer 2

79  + (89 - n)  = 103
79  + 89  - n  = 103
168  - n  = 103
n = 168 - 103
n = 65
===============
79 + (89-65) = 103
79  + 24 = 103
103 = 103 

9z  + 3z  - 13 = 155
12z = 155 +13
12z= 168
z=168 :12
z= 14
=================
9 * 14   + 3*14 - 13 = 155
126 + 42   - 13  = 155
168 - 13 = 155
155=155

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