11n-7n+1-6n+8=-2n+9=-2*(-6)+9=12+9=21
-4a+8c+4a+9c=17c
7х+(2-3х+2)=7х+4-3х=4х+4
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11n-7n+1-6n+8=-2n+9=-2*(-6)+9=12+9=21
-4a+8c+4a+9c=17c
7х+(2-3х+2)=7х+4-3х=4х+4