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B. (xa+x)-(xa-x)=2a+4-> 0=2a+4
C. -> -> -> -> x=4
ax+a+5ax-5=6b-4a
6ax=6b-4a-a+5
6ax=6b-5a+5
x=6b/6a-5a/6a+5/6a
B. x(a + 1) - x(a - 1) = 2a + 4
ax-x-ax+x=2a+4
-2a-4
a=4/-2
a=-2
C. (x + 2)(x - 5) = (x - 1)(x - 6)
x^2-5x+2x-10=x^2-6x-x+6
x^2-3x-10x^2-7x+6
x^2-x^2-3x+7x=6+10
4x=16
x=16/4
x=4
el primero esta un poko dificil!!!
espero te sirva saludos!!!