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3x+12=-37-4x
We simplify the equation to the form, which is simple to understand
3x+12=-37-4x
We move all terms containing x to the left and all other terms to the right.
+3x+4x=-37-12
We simplify left and right side of the equation.
+7x=-49
We divide both sides of the equation by 7 to get x.
x=-7
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