Add a) 15 x 3 - 3x + 7 , 12 x 2 -11, 7 x -4
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Step-by-step explanation:
45-3x+7=52-3x
52-3x=0
52=3x
x=3/-52=-0.05 first answer
12*2-11=24-11=13 second answer
7*-4=-28 third answer
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