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In any parallelogram, the opposite angles are congruent.
So, you can write this equation
m (< A) = m (< C) or
4x + 6 = 6x - 8.
Simplify and find x
6 + 8 = 6x - 4x
14 = 2x
x = 14/2 = 7.
Now calculate the angles m (< A) = 4x + 6 = 4*7 + 6 = 34 degrees
m (< B) = 180 - 34 = 146 degrees.
Solved, answered and explained.