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= 190 - 3x
penyiku dari (x + 30) adalah 90 - (x + 30) = 90 - x - 30
= 60 - x
jadi, 190 - 3x = 60 - x
- 3x + x = 60 - 190
- 2x = - 130
x =
x =
2x + 5 = 2.(65) + 5
= 130 + 5
=