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DEF = 180 - (3x + 10)
= 180 - 3x - 10
= 170 - 3x
BFG = DEF
4x + 30 = 170 - 3x
4x + 3x = 170 - 30
7x = 140
x = 140 / 7
x = 20
BFG = 4x + 30
= 4 (20) + 30
= 80 + 30
= 110