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7*x+15=6*x+21
We simplify the equation to the form, which is simple to understand
7*x+15=6*x+21
We move all terms containing x to the left and all other terms to the right.
+7x-6x=+21-15
We simplify left and right side of the equation.
+1x=+6
We divide both sides of the equation by 1 to get x.
x=6
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