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5x-3x+x+8 = 2x+1+x+x 3x+8 = 4x+1 3x-4x = 1-8 -x = -7 x=7 Hope that helps.
12x + 131 = 189 + 3x 12x - 3x + 131 - 189 = 0 9x - 58 = 0 9x = 58 x = 6,44444
X2+3x+x+3=x(x+1)+3(x+1)=(x+3)(x+1)
3x2 + x = x*(3x + 1)
1 + 3x - x = x - 4 + 2x 1 + 4 = x + 2x - 3x + x 5 = x