what are the numbers that could replace x so that the equation will become true

ex.
a.3+x=8. Answer:6
b.15+x=7. Answer:-8
c.3×-5=16. Answer:7
d.2x-1=2. Answer:⅔

____1.4—8=x. ___6.4x-9=14
____2.x—7=15. ___7.7+11=3x
____3.12+x=4. ___8.2x—7=-11
____4.7—x=15. ____9.4x-9=-35
____5.2x—8=2. ___10.8x-1=0
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