a=5
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2a+5a=3 7a=3 a=3/7 or .4286
3.5
-8a + 6a + 7 = 1 -2a = 1 - 7 -2a = -6 a = 6/2 a = 3 Check: -8(3) + 6(3) + 7 = 1 -24 + 18 + 7 = 1 1 = 1
x=2ab+7 x= 2(3)(5) +7 x=30+7 x=37
2a+7 is a binomial, because it has two terms (2a and 7).