Question

Решите уравнение с проверкой
а) 7-3(x-1)=2x
б)6(2х+2.5)=8х-(2х+4)

Answer 1

$7-3(x-1)=2x \ 7-3x+3=2x \ 10-3x=2x \ -3x-2x=-10 \ -5x=-10 \ x=2 \ \ 7-3(2-1)=2*2 \ 7-3=4 \ 4=4$

$6(2x+2.5)=8x-(2x+4) \ 12x+15=8x-2x-4 \ 12x+15=6x-4 \ 12x-6x=-4-15 \ 6x=-19 \ x= -frac{19}{6} \ \ 6(-frac{19}{3} + frac{25}{10}) =4* frac{19}{3}-( -frac{19}{3}+4) \ \ 6( -frac{38+15}{6})=- frac{76}{3} + frac{7}{3} \ \ -23= frac{-76+7}{3} \ \ -23=-23$