1) x-7= 2x+8

2) 3(x+5)+ 2(x+1)=15

3) 3a +4b =17
9b+12b=?

4) x-y=1
5x-5y =?

5)x/y = 3/5; a/b= 2/4

y/x+b/a=?
Помогите решать задачу



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