A) [(7x)^11 * (49x)^2 * 7] / [(7x^2)^3 * (343x)^4] = 56
49 = 7^2, 343 = 7^3
[7^11*x^11*7^4*x^2*7] / [7^3*x^6*7^12*x^4] = (7^16*x^13) / (7^15*x^10) = 7*x^3 = 56
7*x^3 = 7*8
x^3 = 8
x = 2
b) [(3x)^9 * (9x^4)^3 * x^2] / [(3x^3)^5 * (27x)^3] = -96
9 = 3^2, 27 = 3^3
[3^9*x^9*3^6*x^12*x^2] / [3^5*x^15*3^9*x^3] = (3^15*x^23) / (3^14*x^18) = 3*x^5 = -96
3*x^5 = -3*32
x^5 = -32
x = -2