(2x-7)(x+1)+3(4x-10)(4x+1)=2(5x-2)^2-53

(2х-7)(х+1)+3(4х-10)(4х+1)=2(5х-2)^2-53
2х^2+2х-7х-7+(12х-30)*(4х+1)=2(25х^2-20х+4)-53
2х^2+2х-7х-7+48х^2+12х-120х-30=50х^2-40х+8-53
50х^2-113х-37=50х^2-40х-45
-113х-37=-40х-45
-113х+40х=-45+37
-37х=-8