а) 7,2-(6, 2-x)=2,27,2-6,2+x=2,21+x=2,2x=2,2-1x=1,2б) -5+(а-25) =-4-5+a-25=-4-30+a=-4a=-4+30a=26в) 5/16(дробь) -(3/16-x) =5/85/16 - 3/16 + x = 5/81/8 + x = 5/8x = 5/8 - 1/8x = 4/8 = 1/2г) (x+3) -17=-20x+3-17=-20x-14=-20x=-20+14x=-6д) -(10-b) +23,5=-40,4-10+b+23,5=-40,413,5+b=-40,4b=-40,4-13,5b=-53,9е) (m+8/15) -2/15=0,8m + 8/15 - 2/15 = 0,8m + 6/15 = 0,8m = 0,8 - 6/15m = 0,8 - 0,4m=0,4