$ab+4b-3a;\:a=7;\:b=6$
$3x^4-3y^4$
$\frac{3}{5}a^2-2ab+\frac{1}{10}a^2-a^2-\frac{1}{3}ab+2ab-2a^2$
$15-2^2-1^3\cdot3$
$2-2x-4x^2$
$\left(2x-5b\right)^2$
$\left(a^2+a-6\right)\left(a^2-6\right)$
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