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5x + 4x + 3 - 12 = 90
9x - 9 = 90
9x = 90 + 9
9x = 99
x = 11
b. BOC = 4x - 12
= 4.11 - 12
= 44 - 12
= 32 derajat
c. 90 derajat - 32 derajat = 58 derajat