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x+x+2+x+4+x+6=138
We simplify the equation to the form, which is simple to understand
x+x+2+x+4+x+6=138
We move all terms containing x to the left and all other terms to the right.
+1x+1x+1x+1x=+138-2-4-6
We simplify left and right side of the equation.
+4x=+126
We divide both sides of the equation by 4 to get x.
x=31.5
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