it is 6a
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If 3a+5=5a+3, then: 3a+5 - 3a = 5a+3 - 3a 5=2a+3 5 - 3=2a+3 - 3 2=2a a=1
4a + 3a = (4 + 3)a = 7a
3A + 9B = 3(A + 3B)
x^3 + ax + 3a + 3x^2 = (x^3 + 3x^2) + (ax + 3a) = x^2(x + 3) + a(x + 3) = (x + 3)(x^2 + a)
3a+ax+3b+bx = 3(a+b)+(a+b)x = (a+b)(3+x)