6.219 Найдите корень уравнения: a) $$5n - 2n = 8,4$$; б) $$2m + 6m = 9,6$$; в) $$x + x + 9,246 = 48$$; г) $$7y - 4y - 58,2 = 72,12$$.

a) $$5n - 2n = 8,4$$ $$3n = 8,4$$ $$n = 8,4 / 3 = 2,8$$ n = 2.8 б) $$2m + 6m = 9,6$$ $$8m = 9,6$$ $$m = 9,6 / 8 = 1,2$$ m = 1.2 в) $$x + x + 9,246 = 48$$ $$2x = 48 - 9,246$$ $$2x = 38,754$$ $$x = 38,754 / 2 = 19,377$$ x = 19.377 г) $$7y - 4y - 58,2 = 72,12$$ $$3y = 72,12 + 58,2$$ $$3y = 130,32$$ $$y = 130,32 / 3 = 43,44$$ y = 43.44