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5x+3x-30=42
We simplify the equation to the form, which is simple to understand
5x+3x-30=42
We move all terms containing x to the left and all other terms to the right.
+5x+3x=+42+30
We simplify left and right side of the equation.
+8x=+72
We divide both sides of the equation by 8 to get x.
x=9
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