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OpenStudy (anonymous):
how do i find the opposite of an expression in algebra Question: -10t+21
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OpenStudy (anonymous):
I need to use the substitution method. x-y=5 x+2y=7 If you could just show me the work to reach the solution, I think I can do the rest of the problem?
OpenStudy (anonymous):
opposite would be to change the signs instead of -10t +21 use 10t-21 the complete opposite
OpenStudy (anonymous):
no
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