x2+bx+ax+ab = x2+ax+bx+ab = x(x+a)+b(x+a) = (x+a)(x+b)
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Ax + Bx + C is called an algebraic expression.
Ax + B = Bx + C Ax - Bx = (C - B) x (A - B) = (C - B) x = (C - B) / (A - B)
3a+ax+3b+bx = 3(a+b)+(a+b)x = (a+b)(3+x)
x = -c/(a+b), provided a+b is not 0
B. Sum of two numbers