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18=7x+3-2x
We simplify the equation to the form, which is simple to understand
18=7x+3-2x
We move all terms containing x to the left and all other terms to the right.
-7x+2x=+3-18
We simplify left and right side of the equation.
-5x=-15
We divide both sides of the equation by -5 to get x.
x=3
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