15x -1 you first look for like terms and then combine them! (8x-4x+23x) = 15x then -1 = -1 giving you the answer!
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4x+8x+3 = 12x+3
4x + 3y = 8x + y so 3y - y = 8x - 4x ie 2y = 4x so y = 2x
2x times 4x is 8x squared- then that times x is 8x to the power of three.Mathmatically represented as 8x^3
4x
4x - 10 = -4x + 22 +4x+10=+4x +10 8x = 32 x = 4