Упростите 5x-(6x-(7x-(8x-9))).

Question

Упростите 5x-(6x-(7x-(8x-9))).

Answer 1

5х-(6х-(7х-(8х-9)=5х-6х-7х-8х+9=-16х+9

Answer 2

5x-(6x-(7x-(8x-9)))=5x-(6x-(7x-8x+9))=5x-(6x-(-x+9))=
=5x-(6x+x-9)=5x-(7x-9)=5x-7x+9=-2x+9