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3x+5x+15=180
We simplify the equation to the form, which is simple to understand
3x+5x+15=180
We move all terms containing x to the left and all other terms to the right.
+3x+5x=+180-15
We simplify left and right side of the equation.
+8x=+165
We divide both sides of the equation by 8 to get x.
x=20.625
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