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2\times 4+x\left(1\times 2+1\right)=5
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,2,2x.
8+x\left(1\times 2+1\right)=5
Multiply 2 and 4 to get 8.
8+x\left(2+1\right)=5
Multiply 1 and 2 to get 2.
8+x\times 3=5
Add 2 and 1 to get 3.
x\times 3=5-8
Subtract 8 from both sides.
x\times 3=-3
Subtract 8 from 5 to get -3.
x=\frac{-3}{3}
Divide both sides by 3.
x=-1
Divide -3 by 3 to get -1.