19 and 2 / 1 x plus 3 and 2 / 1 times 2 equals 7. How to calculate?

19 1 / 2 x plus 3 1 / 2 times 2 equals 7
x*39/2+7/2*2=7
x*39/2=7-7
x=0/（39/2）
x=0

What is the number 2.5 less than 4 times x, and what is the number when x equals 1.8?

According to the meaning of the title:
The number 2.5 less than 4 times x is 4x-2.5
When x = 1.8, 4x-2.5 = 4 * 1.8-2.5 = 4.7

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