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10+4x+7x=21
We simplify the equation to the form, which is simple to understand
10+4x+7x=21
We move all terms containing x to the left and all other terms to the right.
+4x+7x=+21-10
We simplify left and right side of the equation.
+11x=+11
We divide both sides of the equation by 11 to get x.
x=1
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