It is not possible to solve one equation in two unknowns (x and y). Two independent equations are required.
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It's just a mathematical polynomial: 7x + 3y.
5x - 3y -7x + 2y +3x = (5-7+3)x + (-3+2)y = x - y
(1) 5x+y=-12 (2) 7x-3y=-30 From (1) one gets y = -12-5x Put into (2) 7x-3y = 7x -3 (-12-5x) = 7x + 36 +15 x = 22x +36=-30 22x = -30-36 = -66 so x = -3 and y=-12-5x = -12-5x-3= 3 The solution is (-3,3)
7x = 5+5x 7x-5x = 5 2x = 5 x = 2.5
x=6