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12x+138=213-3x
We simplify the equation to the form, which is simple to understand
12x+138=213-3x
We move all terms containing x to the left and all other terms to the right.
+12x+3x=+213-138
We simplify left and right side of the equation.
+15x=+75
We divide both sides of the equation by 15 to get x.
x=5
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