1)7y-39=717
7y=717+39
7y=756
y=756:7
y=108
2) x+3x=76
4x=76
x=76:4
x=19
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1)7y-39=717
7y=717+39
7y=756
y=756:7
y=108
2) x+3x=76
4x=76
x=76:4
x=19
7у=717+39 4х=76
7у=756 х=19
у=108