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2x+x+2+x+10=400
We simplify the equation to the form, which is simple to understand
2x+x+2+x+10=400
We move all terms containing x to the left and all other terms to the right.
+2x+1x+1x=+400-2-10
We simplify left and right side of the equation.
+4x=+388
We divide both sides of the equation by 4 to get x.
x=97
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