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(x² + 2x + 1) - 3(2-x) = x² - 10
x² + 2x + 1 - 6 + 3x = x² - 10
5x = -5
x = -1
x^+2x+1-6+3x=x^-10
x^-x^+2x+3x=-10+6-1
5x=-5 /:5
x=-1