nepsa2020
nepsa2020
06-10-2016
Mathematics
contestada
solve the equation 3(x-7)-x=2x-21
Respuesta :
apologiabiology
apologiabiology
06-10-2016
first, distribute
3(x-7)=3x-21
3x-21-x=2x-21
3x-1x-21=2x-21
add like terms
2x-21=2x-21
minus 2x oth sides
-21=-21
true
we see that the x's wil cancel
therfor x=all real numbers
Answer Link
Noah11012
Noah11012
06-10-2016
3(x - 7) - x = 2x - 21
Distribute the the 3: 3x - 7 -x = 2x - 21
Add like terms: 4x - 7 = 2x - 21
Subtract 2x on both sides: 2x - 7 = -21
Add -7 to both sides: 2x = -28
x = -14
Answer Link
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