0,6(2х²+3) - 7(2-x²) = 2(3x²+1) - 1

0,6( 2х²+ 3 ) - 7( 2 - х²) = 2( 3х²+ 1 ) - 13/5 × ( 2х²+ 3 ) - 14 + 7х² = 6х²+ 2 - 16/5х²+ 9/5 - 14 + 7х² = 6х²+ 2 - 141/5х²- 6х² = 1 + 61/511/5х² = 66/5х² = 6х = + √6х = √6х = - √6х = √6., х = - √6