Question

$7x - (x - 2) {}^{3} = 13 - x {}^{2}(x - 6)$

Answer 1

7х-(х-2)³=13-х²(х-6)
7х-(х-2)(х-2)(х-2)=13-х³+6х²
7х-(х³-6х²+12х-8)=13-х³+6х²
7х-12х+8=13
-5х+8=13
-5х=13-8
-5х=5
х=-1