Okay so,
(Heads up! If it’s a number (the one in photo, I don’t know how to type it so imma put a *(number))
3K+2K(5K-3)=7
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3K+2Kx(5K-3)=7
Multiply parentheses by 2K
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3K+10K*2-6K=7
Collect the like terms
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-3K+10K*2=7
Move the constant to the left
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-3K+10K*2-7=0
Reorder the terms
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10K*2-3K-7=0
Solve the quadratic equation
