exam Maths Puzzle Numerical Ability

Solve:
8x+30>4x+38
-4X -4X
------------
4X+30>38
-30-30
----------
4X>8
-- --
4 4
x>2

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exam Other Question

How do you solve 4x-y=19? Do you replace in the x and then a y with any #? solve t=1/4n+40
and show work or explain it please.. thank you.