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Combining like terms $3x$ and $x$
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$4x+9=0$
Learn how to solve one-variable linear equations problems step by step online. Solve the equation 3x+x+9=0. Combining like terms 3x and x. We need to isolate the dependent variable , we can do that by simultaneously subtracting 9 from both sides of the equation. Canceling terms on both sides. Divide both sides of the equation by 4.