4x+6x=30 is the same as:
10x=30 so we divide by 10 and get:
x=3
(I do not see how this relates to calculus, but O.K.)
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4x + 6 = 6x - 12-4x -4x6 = 2x - 12+12 +1218 = 2xx=9
x=5. 10x-4x (6x) +10-6x (=10) If 10 is 2x, x=5.
2x + 5 = 7 - 4x ie 2x + 4x = 7 - 5 ie 6x = 2 x = one third.
3x - 12 = 10x - 15 - 6x -10 3x - 12 = 4x -25 3x + 13 = 4x 13 = 4x - 3x 13 = x None?
-1-2x-4x=19-6x-1 = -19x = 3