№1
a) 6x = 24
$$x = \frac{24}{6}$$ $$x = 4$$Ответ: x = 4
б) 13x = -39
$$x = \frac{-39}{13}$$ $$x = -3$$Ответ: x = -3
в) 8x = 4
$$x = \frac{4}{8}$$ $$x = \frac{1}{2}$$ $$x = 0,5$$Ответ: x = 0,5
г) 6x = 7,5
$$x = \frac{7,5}{6}$$ $$x = \frac{75}{60}$$ $$x = \frac{5}{4}$$ $$x = 1,25$$Ответ: x = 1,25
№2
a) 3x + 8 = x - 12
$$3x - x = -12 - 8$$ $$2x = -20$$ $$x = \frac{-20}{2}$$ $$x = -10$$Ответ: x = -10
б) x + 4 = 3 - 2x
$$x + 2x = 3 - 4$$ $$3x = -1$$ $$x = -\frac{1}{3}$$Ответ: $$x = -\frac{1}{3}$$
в) 5y = 2y + 16
$$5y - 2y = 16$$ $$3y = 16$$ $$y = \frac{16}{3}$$Ответ: $$y = \frac{16}{3}$$
г) -2x + 9 - 8 = x - 1
$$-2x + 1 = x - 1$$ $$-2x - x = -1 - 1$$ $$-3x = -2$$ $$x = \frac{-2}{-3}$$ $$x = \frac{2}{3}$$Ответ: $$x = \frac{2}{3}$$
д) 43 + 4x + (11 - 5x) = 7
$$43 + 4x + 11 - 5x = 7$$ $$54 - x = 7$$ $$-x = 7 - 54$$ $$-x = -47$$ $$x = 47$$Ответ: x = 47
e) 6(x+11)-7x = 73+x
$$6x + 66 - 7x = 73 + x$$ $$-x + 66 = 73 + x$$ $$-x - x = 73 - 66$$ $$-2x = 7$$ $$x = \frac{7}{-2}$$ $$x = -3,5$$Ответ: x = -3,5