Решение уравнений:

1. $$5x + 6x = 2211$$$$11x = 2211$$$$x = \frac{2211}{11}$$$$x = 201$$Ответ: x = 201
2. $$(x - 30) : 2 = 380$$$$x - 30 = 380 \cdot 2$$$$x - 30 = 760$$$$x = 760 + 30$$$$x = 790$$Ответ: x = 790
3. $$12 \cdot (60+ x) = 9600$$$$60 + x = \frac{9600}{12}$$$$60 + x = 800$$$$x = 800 - 60$$$$x = 740$$Ответ: x = 740
4. $$123 \cdot x - 212 = 403$$$$123x = 403 + 212$$$$123x = 615$$$$x = \frac{615}{123}$$$$x = 5$$Ответ: x = 5
5. $$87100 : (870 + x) = 100$$$$870 + x = \frac{87100}{100}$$$$870 + x = 871$$$$x = 871 - 870$$$$x = 1$$Ответ: x = 1
6. $$100 \cdot (1530 - x) = 53000$$$$1530 - x = \frac{53000}{100}$$$$1530 - x = 530$$$$x = 1530 - 530$$$$x = 1000$$Ответ: x = 1000
7. $$378 + x : 7 = 589$$$$x : 7 = 589 - 378$$$$x : 7 = 211$$$$x = 211 \cdot 7$$$$x = 1477$$Ответ: x = 1477
8. $$648 : (7x - 4) = 27$$$$7x - 4 = \frac{648}{27}$$$$7x - 4 = 24$$$$7x = 24 + 4$$$$7x = 28$$$$x = \frac{28}{7}$$$$x = 4$$Ответ: x = 4
9. $$1472: (7 + 5x) = 46$$$$7 + 5x = \frac{1472}{46}$$$$7 + 5x = 32$$$$5x = 32 - 7$$$$5x = 25$$$$x = \frac{25}{5}$$$$x = 5$$Ответ: x = 5
10. $$(x + 413) : 26 = 103$$$$x + 413 = 103 \cdot 26$$$$x + 413 = 2678$$$$x = 2678 - 413$$$$x = 2265$$Ответ: x = 2265