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2x+7x-12-5x=8
We simplify the equation to the form, which is simple to understand
2x+7x-12-5x=8
We move all terms containing x to the left and all other terms to the right.
+2x+7x-5x=+8+12
We simplify left and right side of the equation.
+4x=+20
We divide both sides of the equation by 4 to get x.
x=5
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