Steps:
y - 7y + 6 = 30
-6y + 6 = 30
-6y + 6 - 6 = 30 - 6
-6y = 24
-6y / -6 = 24 / -6
y = -4
Check work:
-4 - 7(-4) + 6 = 30
-4 - (-28) + 6 = 30
-4 + 28 + 6 = 30
24 + 6 = 30
30 = 30
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6x - 4y
7y+5=-9... 7y must equal -14 therefore y must be -2
4X2+X3+3X+7Y+2X3 can only be simplified to 3X3+4X2+3X+7Y, because X3 and 2X3 are the only like terms.
(4, -7)
That depends what you want it to equal at the end.