$-15:\:\left(-7+\:2\right)$
$12+\left(21-\left(15-\left(-4\right)\right)\right)$
$3g^2+27g^2-15g$
$2a^2+a+6ba+3b-10a+20ab-5$
$7x^2b-21xb+49b^2$
$8.48+-3.38$
$-4-x=2x+x-4$
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