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Factorizing the biggest common factor using common factor methode | 
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Got it !
| $10ac+15a^2c =$ | $5ac(2+3a) $ |
| $a(x+y)+b(x+y) =$ | $(x+y)(a+b) $ |
| $(a-b)+x(a-b) =$ | $(a-b)(1+x) $ |
| $x^{m+1}y^m - x^my^2 =$ | $x^my^2(x-y^{m-2}) $ |
| $4(y-5) + a(5-y)$ | $(y-5)(4-a) $ |
| $x(b+4)-6x(b+4) $ | $-5x(b+4) $ |
| $4b(y+2)+5(2+y) $ | $(4b+5)(2+y) $ |
| $(x+3)^2-(x+3) $ | $(x+3)(x+3-1)=(x+3)(x+2) $ |
| $2(x+5)-(x+5)^2 $ | $(x+5)(-3-x) $ |
| $25a^2(a-6)-1a(a-6)^2 $ | $15a(a-6)(a+4) $ |