madiliann12120
14.01.2020 •
Mathematics
The sum of 36.4 and a number is 39.21, as shown below. what number should go in the box to complete the addition problem?
numerical answers expected!
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Ответ:
Ответ:
x = 12
Step-by-step explanation:
34(16x + 16) = 37((438)(x) − 21)
18x + 12 = 158x − 9
18x + 12 − 158x = 158x − 9 − 158x
−74x + 12 = −9
−74x + 12 −12 = −9 −12
−74x = −21
(4−7) × (−74x) = (4−7) × (−21)
x = 12