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x² +10 -30 = 80
x² -20 = 80
x² = 80 +20
√x² = √100
x = √100
x = 10
En la raíz cuadrada tenemos dos soluciones +10 y -10
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4x +71 -2x = x +9²
4x +71 -2x = x +81
4x -2x -x = 81 -71
x = 10
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x² - 8x -90 = 10 -8x
x² -8x +8x = 10 +90
x² = 100
√x² = √100
x = 10