7-(2х-2)*(4х+1)=2х*(5-4х)
7-(8х^2+2x-8x-2)=10x-8x^2
7-(8x^2-6x-2)=10x-8x^2
7-8x^2+6x+2=10x-8x^2
6x+9=10x
6x-10x=-9
-4x=-9
x=9/4
x=2.25
(x+2)(x-6)-(x-7)(x+7)<30-3x<br>x^2+2x-6x-12-(x^2-49)<30-3x<br>x^2-4x-12-x^2+49<30-3x<br>-4x+3x<30-49+12<br>-x<-7<br>x>7
(3x+2)^2-(4-3x)^2<=14+37x<br>применяем формулу сокращенного умножения
9x^2+12x+4-(16-24x+9x^2)<=14+37x<br>9x^2+12x+4-16+24x-9x^2<=14+37x<br>36x-37x<=14+12<br>-x<=26<br>x>=-26