you'll need basic algebra. from PMDAS(parenthesis, multiplication, division, addition, subtraction) . ito ung pagkakasunod sunod ng operation nagagawin mo sa isang equation
Solve it . how to? .. ung variable dun sa equation mo palitan mo ng value then solve it :D . when you change the variable to value it become . -2x{-1+3(2(2)-3)-(5(1)+3(2)-4} . but im not yet sure . i'll forgot ! xD
