3,2x+2,7=0,48-0,02x
2,7x+0,02x=-3,2+0,48
2,72x=-2,72
x=-2,72:2,72
x=-1
18⁶/6⁷*3⁵=(6⁶ *3⁶)/6⁷*3⁵=6⁶⁻⁷*3⁶⁻⁵=6⁻¹*3¹=3¹/6¹=1/2
f'= ((2x-3)'(x+4)-(2x-3)(x+4)')/(x+4)²= (2(x+4)-(2x-3))/(x+4)²= (2x+8-2x+3)/(x+4)²= 11/(x+4)²
f'(-5)= 11/(-5+4)²= 11
3x = 28 - 38
3x = - 10
x = - 10/3
x = - 3 целых 1/3