Since he starts with (10x+7) dollars and is buying two pairs of jeans that each cost (4x-5) dollars you should subtract the cost of the jeans from his starting amount.
(10x+7)-2(4x-5)=
10x+7-8x+10=
2x+17
ANSWER:
X= radical 15/3 , radical -15/3
Decimal form:
X=1.29099444
X=-1.29099444
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T 1 2 3 4
B 3 6 9 12
This is linear relationships B=3*T (it can be also called directly proportional)