Can someone help me to figure out this equation. I don't remember how to do this with the outside brackets
2{[5(c-4)+15]-[3(5c-3)+1]} = 2{[5c-20+15]-[15c-9+1]} = 2{[5c-5]-[15c-8]} = 2{5c-5-15c+8]} = 2{-10c+3]} = -20c + 6
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