Answer:
19) x = 5
20) x = 11
Step-by-step explanation:
The applicable relation in each case is that the exterior angle is equal to the sum of the remote interior angles.
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19)
25x -3 = 93 +(6x -1) . . . . . use the known relationship
19x = 95 . . . . . . . . . . . . add 3 -6x and simplify
x = 5 . . . . . . . . . . . . divide by 19
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20)
12x -7 = 45 +(8x -8) . . . . . use the known relationship
4x = 44 . . . . . . . . . . . . . add 7-8x and simplify
x = 11 . . . . . . . . . . . . divide by 4
