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x-3=2x-4\left(-1\right)
Multiply 3 and -1 to get -3.
x-3=2x-\left(-4\right)
Multiply 4 and -1 to get -4.
x-3=2x+4
The opposite of -4 is 4.
x-3-2x=4
Subtract 2x from both sides.
-x-3=4
Combine x and -2x to get -x.
-x=4+3
Add 3 to both sides.
-x=7
Add 4 and 3 to get 7.
x=-7
Multiply both sides by -1.