2110+95=3102110x+95=310x
21105+95=31021105x+95=310x
21105+95=310,≠−95,≠021105x+95=310x,x≠−95,x≠0
21⋅510(5+9)=31021⋅510(5x+9)=310x
212(5+9)=310212(5x+9)=310x
210=6(5+9)210x=6(5x+9)
210=30+54210x=30x+54
210−30=54210x−30x=54
180=54180x=54
=54180x=54180
=310,≠−95,≠0x=310,x≠−95,x≠0
=310
х=0.3
1)-х+2=7
-х=7-2
-х=5
х=-5
2)х+2=7
х=7-2
х=5
Ответ: (-5;5)