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Anna11 [10]
4 years ago
11

Solve 7x - 4 = 5x + 15 for x.

Mathematics
1 answer:
Law Incorporation [45]4 years ago
8 0
7x-4=5x+15
-5x on both sides
2x-4=15
add four to both sides
2x=19
divide both sides by 2 to isolate x
x=9.5
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Anything to the -1 is just the reciprocal of that thing. If it's -2, it's the reciprocal squared; -3 is reciprocal cubed, etc.

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