Respuesta :
The simplified form of the expression is 15x - 21y
Simplifying expressions
Equations are expressions separated by an equal sign. Given the expression. below;
12x -18y+3x-3y
Collect the. like terms
12x + 3x - 18y -3y
Simplify
12x -18y+3x-3y = 15x - 21y
Hence the simplified form of the expression is 15x - 21y
Learn more on expressions here: https://brainly.com/question/723406
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