It is an equation in the single unknown variable, a.
a = -4
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5x - 8a + 4a - 2x + a = 3x - 3a
48a3 + 32a2 + 4a = 4a(12a2 + 8a + 1)
20a plus 14 will be 34a minus 8a minus 7 34a minus 8 is 26a minus 7 is 19a. The single b is 1b plus 6b which is 7b minus 2b equals 5b.
11a-3a =8a so 8a+9=-7 8a = -16 a=-2
−4a + 139 = 4a + 123 → −8a = −16 → a = 24a + 123 → 4(2) + 123 = 8 + 123 = 131°