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To solve the inequality we can divide both sides by $7.$

$7x\gt\text{-}21$

DivIneq$\left.\text{LHS}\middle/7\right.\gt\left.\text{RHS}\middle/7\right.$

$x\gt\text{-}3$

$x\gt\text{-}3$ solves the inequality.

b

The solution set is $z\gt10.$