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138-2x=25x+21
We simplify the equation to the form, which is simple to understand
138-2x=25x+21
We move all terms containing x to the left and all other terms to the right.
-2x-25x=+21-138
We simplify left and right side of the equation.
-27x=-117
We divide both sides of the equation by -27 to get x.
x=4.3333333333333
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