(2х-1)(15+9х)-6х(3х-5)=87
(14х-1)(2+х)=(2х-8)(7х+1)
(х+10)(х-5)-(х-6)(х+3)=16
(3х+7)(8х+1)=(6х-7)(4х-1)+93х

1)30X+18x^2-15-9x-18x^2+30x=8751x-15-87=051x=15+8751x=102x=22)28x+14x^2-2-x=14x^2+2x-56x-828x+14x^2-2-x-14x^2-2x+56x+8=081x+6=081x=-6x=-2/273)x^2+5x-50-x^2-3x+6x+18=168x-32=168x=16+328x=48x=64)24x^2+3+56x+7=24x^2-6x-28x+7+93x24x^2+3+56x+7-24x^2+6x+28x-7-93x=00=0