Oh, dude, the value of x in that equation is 5. Like, you just add 3 to both sides, then divide by 7. It's like basic math, man.
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Strictly speaking the above equation is a tautological equation or an IDENTITY. An identity is true for all values of any variables that appear in it. Thus, the above "equation" is true for all value of x. - that is, it has infinitely many solutions.
If you mean: y=7x -3 then it is a proportional relationship of a straight line equation.
If you mean x = 3 then the value of 7x-2x is 21-6 = 15
The value of x2+7x+10 depends on the value of X. If x=1, then x2+7x+10 = 18 If x=2, then x2+7x+10 = 28 If x=3, then x2+7x+10 = 40 and so forth
If "equations-" is intended to be "equations", the answer is y = -2. If the first equation is meant to start with -3x, the answer is y = 0.2