4. Решите уравнение: 1) 12x - 5x = 3,192; 2) 7x + 5x + 0,28 = 9,1; 3) 6x - 14,7 = 22,05; 4) 7,48 - 16x = 2,68.

1) $$12x - 5x = 3,192$$ $$7x = 3,192$$ $$x = 3,192 : 7$$ $$x = 0,456$$ 2) $$7x + 5x + 0,28 = 9,1$$ $$12x = 9,1 - 0,28$$ $$12x = 8,82$$ $$x = 8,82 : 12$$ $$x = 0,735$$ 3) $$6x - 14,7 = 22,05$$ $$6x = 22,05 + 14,7$$ $$6x = 36,75$$ $$x = 36,75 : 6$$ $$x = 6,125$$ 4) $$7,48 - 16x = 2,68$$ $$-16x = 2,68 - 7,48$$ $$-16x = -4,8$$ $$x = -4,8 : (-16)$$ $$x = 0,3$$