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You would take the measure of the full angle, 145 degrees and subtract it by 20 degrees, to get 125 degrees. Then subtract by the remaining 25 degrees to get 100 degrees, the measure of DCE.

i believe that is true.

step-by-step explanation:

hope my answer has you if not i'm sorry.

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x