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3+x\left(-7\right)=-1+x\left(-6\right)
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by x.
3+x\left(-7\right)-x\left(-6\right)=-1
Subtract x\left(-6\right) from both sides.
3-x=-1
Combine x\left(-7\right) and -x\left(-6\right) to get -x.
-x=-1-3
Subtract 3 from both sides.
-x=-4
Subtract 3 from -1 to get -4.
x=4
Multiply both sides by -1.