5√8x=25√8x-5x
25√8x-5√8x-5x=0
5x(5√8-√8-1)=0
5x(5√8-1)=0
5x=0
x=0
(-7x-1)**=49x**+14x+1;
(a**-2b)**=a****-4a**b+4b**;
(8x+x***)**=64x**+16x***8+x******;
(4a-b**)**=16a**-8ab**+b****;
(x****-9x)**=x******-18x*****+81x***
(3а-в)**-(3а+в)**=9a**-6ab+b**-9a**-6ab-b**=-12ab;
(a+(b-c))**=a**+2a(b-c)+(b-c)**=a**+2ab-2ac+b**-2bc+c**;
(2x+y)**-(2x-y)**=4x**+4xy+y**-4x**+4xy-y**=8xy;
(c-(a+b))**=c**-2c(a+b)+(a+b)**=c**-2ac-2bc+a**+2ab+b**