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7x+10+x+5=21x
We simplify the equation to the form, which is simple to understand
7x+10+x+5=21x
We move all terms containing x to the left and all other terms to the right.
+7x+1x-21x=-10-5
We simplify left and right side of the equation.
-13x=-15
We divide both sides of the equation by -13 to get x.
x=1.1538461538462
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