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(-10)*(2+х+y)=

(-7)*(a+b+5)=

-9*(x+7+y)=

2*(5-x-y)=

(-3)*(a+10-b)=

7*(x-1+y)=

(-15)*(c-d-3)=

4*(a-b+8)=

(-12)*(-x-y+2)=

(-10)*(2+х+y)=-20-10x-10y
(-7)*(a+b+5)=-7a-7b-35
-9*(x+7+y)=-9x-63-9y
2*(5-x-y)=10-2x-2y
(-3)*(a+10-b)=-3a-30+3b
7*(x-1+y)=7x-7+7y
(-15)*(c-d-3)=-15c+15d+45
4*(a-b+8)=4a-4b-32
(-12)*(-x-y+2)=12x+12y-144