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3x + 3 = 90
3x = 90 - 3
x = 87 : 3
x = 29 derajat
thanks
(x+18)+(2x-15) = 90
3x+3 = 90
3x = 90 - 3 = 87
x = 87/3
= 29 derajat
Itu menurut sya,
maaf klo salah