упростите :
b(m-7)-7b
x(c+1)+c(x-1)
y(x-4)+x(3-y)
m(k-3)-k(m-5)
a(1-b)-a(1+b)
b(2d-5)-b(d+5)

b(m-7)-7b=bm-7b-7b=bm-14bx(c+1)+c(x-1)=xc+x+xc-c=xc+x-cy(x-4)+x(3-y)=xy-4y+3x-xy=3x-4ym(k-3)-k(m-5)=mk-3m-mk+5k=5k-3ma(1-b)-a(1+b)=a-ab-a-ab=-2abb(2d-5)-b(d+5)=2bd-5b-bd-5b=bd-10bd