2а-(14-3а)= -10
2а-14+3а= -10
5а= -10+14
5а=4
а=0,8
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2×0,8-(14-3×0,8)=-10
-10=-10
29*49-29*59=29(49-59)=29*(-10)=-290
-949-37+(949-63)=-949-37+949-63=-37-63=-100