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a=5
2a+5a=3 7a=3 a=3/7 or .4286
2a - 4y = 3a - 8a - 5y 7a = -ya = -(y/7)
a + a + a - 2a = 3a - 2a = a
x=2ab+7 x= 2(3)(5) +7 x=30+7 x=37