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13.09.2020 •
Mathematics
3x+7=5x-21 Find the value of x
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Ответ:
3x+7−5x=−21
Add 3x and −5x to get −2x.
−2x+7=−21
Since 7 does not have the variable to solve for, move it to the right hand side of the equation by subtracting 7 from both sides.
−2x=−7−21
Subtract 21 from −7 to get −28.
−2x=−28
Divide each term in the equation by −2.
x=14
x=14
Ответ:
10/15 - 9/15, I believe is the answer