ALGEBRA 2 PROBLEM PLZ HELP!!! MODULAR ARITHMETIC (MOD)?

THIS IS SO HARD AND IT DOESNT MAKE SENSE CAN YOU PLEASE PLEASE HELP ME AND EXPLAIN HOW TO WORK IT?

solve for x: 3x-6 ? 2(mod 7)

WTF? plz helppp1!!!
our teacher didnt explain about it! plzzz help
 
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