1) 9х-6(х-1)=5(х+2)
9х-6х-9=5х+10
9х-6х-5х=10+19
-2х=29 | ÷ (-2)
х = -14,5.
2) 3х(х+у+с)-3у(х-у-с)-3с(х+у-с)=
=3x²+3xy+3xc-3xy+3y²+3yc-3xc-3yc+3c²=
=3x²+3y²+3c²=3(x²+y²+c²).
1) 9х-6(х-1)=5(х+2)
9х-6х-9=5х+10
9х-6х-5х=10+19
-2х=29 | ÷ (-2)
х = -14,5.
2) 3х(х+у+с)-3у(х-у-с)-3с(х+у-с)=
=3x²+3xy+3xc-3xy+3y²+3yc-3xc-3yc+3c²=
=3x²+3y²+3c²=3(x²+y²+c²).