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2x + 3x + x = 90
6x = 90
x = 90/6
x = 15
b.
14x + 6x = 90
20x = 90
x = 90/20
x = 4,5
c.
2x + 5x + 2x = 90
9x = 90
x = 90/9
x = 10
d.
10x + 15x + 20x = 90
45x = 90
x = 90/45
x = 2