exam Maths Puzzle Numerical Ability

hello,
with the substitution method, how to solve:

x = y + 5
2x - 2y = 12

thank you.

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exam Other Question

ok i no how to do algibra BUT!

i dont no when to add or subtract the varibles!

example 3x+6=8x-9 so..... do i add or subtract the 3x and 8x

please help me!!!!

from
hockey girl tell me the first 100 prime numbers