$-5x+3\:para\:x=-2$
$\tan\left(4x\right)=-\tan\left(2x\right)$
$\left(b+2\right)\left(b-7\right)$
$4x+4<9x+9$
$25y^2\:-\:121b^2$
$5a+4a^2,\:a=12$
$\int4x^2\cos\left(9x\right)dx$
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