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4x-4+3x=-4
Add 3x to both sides.
7x-4=-4
Combine 4x and 3x to get 7x.
7x=-4+4
Add 4 to both sides.
7x=0
Add -4 and 4 to get 0.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since 7 is not equal to 0, x must be equal to 0.