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6x = 90
x = 90/6
=15
b.6x + 14 x = 90
20x = 90
x = 90/20 = 4.5
c. 2x + 5x + 2x = 90
9x = 90
x = 90/9 = 10
d. 10x + 15x + 20x = 90
45x = 90
x = 90/45 = 2
maaf kalau ada yang salah:)