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Multiply $1$ times $-2$
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$224=2x\left(20-2x\right)+20x$
Learn how to solve equations problems step by step online. Find the roots of 224=2x(20+1*-2x)+20x. Multiply 1 times -2. Multiply the single term 2x by each term of the polynomial \left(20-2x\right). Combining like terms 40x and 20x. Rearrange the equation.