Найдите корень уравнения и выполните проверку a) -z.5 = -150; б) 4. (-z) = −32; в) -0,4у = 44; г) 1/7 z = -1; д) 5/7 t = -2; e) -4/9 z =

a) $$-z \cdot 5 = -150$$ $$-5z = -150$$ $$z = -150 : (-5)$$ $$\textbf{z = 30}$$ б) $$4 \cdot (-z) = -32$$ $$-4z = -32$$ $$z = -32 : (-4)$$ $$\textbf{z = 8}$$ в) $$-0,4y = 44$$ $$y = 44 : (-0,4)$$ $$y = -110$$ $$\textbf{y = -110}$$ г) $$\frac{1}{7}z = -1$$ $$z = -1 \cdot 7$$ $$\textbf{z = -7}$$ д) $$\frac{5}{7}t = -2$$ $$t = -2 \cdot \frac{7}{5}$$ $$t = -\frac{14}{5}$$ $$\textbf{t = -2,8}$$ е) $$-\frac{4}{9}z = $$ (условие не полное)