$10.7\cdot4$
$18z-9d=75$
$\left(-1\right)\cdot4\left(-7\right)$
$3x^3+4x^3-59x-20$
$-65+-75$
$121+21a\left(2\right)b\left(2\right)+a\left(4\right)b\left(4\right)$
$1+\cos10y=2\cos^{2}5y$
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