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`x-3x-150=0`

We simplify the equation to the form, which is simple to understand

x-3x-150=0

We move all terms containing x to the left and all other terms to the right.

+1x-3x=0+150

We simplify left and right side of the equation.

-2x=+150

We divide both sides of the equation by -2 to get x.

x=-75

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