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2\times 2=5-x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 2x, the least common multiple of x,2x.
4=5-x
Multiply 2 and 2 to get 4.
5-x=4
Swap sides so that all variable terms are on the left hand side.
-x=4-5
Subtract 5 from both sides.
-x=-1
Subtract 5 from 4 to get -1.
x=1
Multiply both sides by -1.