# Function: safeSubtractKeepLeft()

> **safeSubtractKeepLeft**\<`T`\>(`left`, `right`): `T`

Defined in: [packages/bitbadgesjs-sdk/src/common/math.ts:88](https://github.com/BitBadges/bitbadgesjs/blob/master/packages/bitbadgesjs-sdk/src/common/math.ts#L88)

Safe subtracts two uints and returns an error if the result is invalid. Keeps the left type.

## Type Parameters

### T

`T` *extends* [`NumberType`](https://docs.bitbadges.io/sdk/reference/type-aliases/number-type)

## Parameters

### left

`T`

### right

[`NumberType`](https://docs.bitbadges.io/sdk/reference/type-aliases/number-type)

## Returns

`T`