|19x/2+25|=5
19x/2+25=5
19x/2+25=-5
x1=-49/19
x2=-60/19
tF=1.8tC+32
Подгоняем значения.
tF=1.8 × (-25) + 32 = -45 + 32 = -13°F
8x*3+27=0
8x*3=-27
x*3=-27/8
x=-3/2=-1,5