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7x+5+4+9=0
We simplify the equation to the form, which is simple to understand
7x+5+4+9=0
We move all terms containing x to the left and all other terms to the right.
+7x=0-5-4-9
We simplify left and right side of the equation.
+7x=-18
We divide both sides of the equation by 7 to get x.
x=-2.5714285714286
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