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-84x-36
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4\left(-\left(-7x\right)-\left(-3\right)\right)\left(-3\right)
To find the opposite of -7x-3, find the opposite of each term.
4\left(7x-\left(-3\right)\right)\left(-3\right)
The opposite of -7x is 7x.
4\left(7x+3\right)\left(-3\right)
The opposite of -3 is 3.
-12\left(7x+3\right)
Multiply 4 and -3 to get -12.
-84x-36
Use the distributive property to multiply -12 by 7x+3.
4\left(-\left(-7x\right)-\left(-3\right)\right)\left(-3\right)
To find the opposite of -7x-3, find the opposite of each term.
4\left(7x-\left(-3\right)\right)\left(-3\right)
The opposite of -7x is 7x.
4\left(7x+3\right)\left(-3\right)
The opposite of -3 is 3.
-12\left(7x+3\right)
Multiply 4 and -3 to get -12.
-84x-36
Use the distributive property to multiply -12 by 7x+3.
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