$\left(-7\right)^4+145$
$\:-4x\:-\:2$
$2x^2=4x$
$\left(m^2\:n^4\:p^6\right)^8$
$5y+3=2y+a$
$\left(6-2b\right)^2$
$\:2ab+4a,\:a=3,\:b=1$
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