Срочно!!!Помогите решить пожалуйста, с решениями!
15х+3х=18
8у+9у=17
10z-2z=16
14a-9a=25
15x+3x+2x=20
8y+9y+7=24
10z-2z-4=12
14a-9a-4=21
15*(x-3)+2=62
8:(9-y)-7=1
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