Условие:

1) 2x +2^(х-3) = 18;

2) 3x +4* 3^(x + 1) = 13;

3) 2 * 3^(х + 1) - 6 * 3^(х - 1) - 3х = 9;

4) 5^(x + 1) + 3 * 5^(х-1) - 6 * 5х + 10 = 0.