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What value of x makes the equation true? 3x+21=8x-4
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What value of x makes the equation true? 3x+21=8x-4

User Jim Maguire
by
8.5k points

2 Answers

6 votes
3x+21=8x-4
3x-8+21=-4
3x-8x=-4-21
-5x=-4-21
-5x=-25
x=5
User Mschwarz
by
8.1k points
5 votes

Answer:

x=5

Explanation:

3 times 5= 15

15+21= 36

8 times 5 = 40

40-4=36

User Vandus
by
7.2k points
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