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3a^2+3ab-a-b
(a-c)(c-x)=
ac-ax-c^2+cx
(9-2g)(4h-5)=
36h-45-8gh+10g
(5x-6y)(7z+10w)=
35xz+50wx-42yz-60wy
(d+a)(3x-2)=
3dx-2d+3ax-2a
(a+b)(s+100)=
as+100a+bs+100b
(12ax-7by)(4ad+9wz)=
36a^2dx+108awxz-28abdy-63byz
(-4a+7)(-2+z)=
8a-4az-14+7z
(ax-5d)(x-y)=
ax^2-axy-5dx+5dy
(10-9x)(15+y)=
150+10y-141x-9xy