5у=4-7
5у=-3
у=-3:5
у=-0,6
5*-0,6+7=4
4=4
8х=5-2+3
8х=6
х=6:8
х=0,75
8*0,75-3=5-2
6-3=3
3=3
1
(1/3)^x=9
(1/3)^x=(1/3)^-2
x=-2
2
2^(2x-7)=8
2^(2x-7)=2³
2x-7=3
2x=3+7
2x=10
x=10:2
x=5
3
log(2)x=3
x=2³
x=8
4
log(1/2)(3x+1)=-2
3x-1=(1/2)^-2
3x+1=4
3x=4-1
3x=3
x=3:3
x=1
(x - 1)² - (x + 3)(x - 3 ) = x² - 2x + 1 - (x² - 9) = x² - 2x + 1 - x² + 9 = - 2x + 10