$-3+9c=-39$
$\left(+3\right)\:-\:\left(-2\right)\:+\:\left(+8\right)\:-\:\left(+2\right)\:+\:\left(-1\right)$
$x+3y+2z=2$
$\int\frac{x+7}{x\left(x^2+1\right)}dx$
$\int12x\:5^x\:dx$
$\int6x^2e^{8x^3+4}dx$
$75+48a^2-120a$
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