Working from left to right find the solution to the calculation.

WELSH INSTRUCTIONS

EASY HAWDD 1 + 2 x 3 - 4 x 5 + 6 - 7
MEDIUM CANOLIG 1 - 2 x 3 + 4 x 5 - 6 - 7
HARD ANODD 1 x 2 x 3 x 4 x 5 x 6 x 7

RESETAILDDECHRAU
CHECKGWIRIO
PRINTARGRAFFU