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12-5x-4x=1
We simplify the equation to the form, which is simple to understand
12-5x-4x=1
We move all terms containing x to the left and all other terms to the right.
-5x-4x=+1-12
We simplify left and right side of the equation.
-9x=-11
We divide both sides of the equation by -9 to get x.
x=1.2222222222222
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