$-7^3\left(11^4-6^2+2\right)$

$\:9x\:-\:3y\:+\:\left(-10x\right)\:+\:\left(-8y\right)$

$\left(-40\right)+\left(-20\right)+30+\left(-10+20-50-8+12\right)$

$3x^2-2x+3=0$

$5.6=-\log x$

$\left(-9\right)-\left(-26\right)-45$

$5\left(x^2+1\right)-3\left(x^2+1\right)+2\left(x^2+1\right)$