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3x+4x+5x=300
We simplify the equation to the form, which is simple to understand
3x+4x+5x=300
We move all terms containing x to the left and all other terms to the right.
+3x+4x+5x=+300
We simplify left and right side of the equation.
+12x=+300
We divide both sides of the equation by 12 to get x.
x=25
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