Question

identifiquei o valor de x em cada equação.
a) 53-2×= -5× -7
B) 14×-8= -6×+42​

Answer 1

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A-

${\purple{53 - 2x = - 5x - 7}} \\ {\purple{53 - 2x + 5x - 7 + 5x}} \\ {\purple{53 - 2x + 5x = - 7}} \\ {\purple{53 - 2x + 5x - 53 = - 7 - 53}} \\ {\purple{ - 2x + 5x = - 7 - 53}} \\ {\purple{3x = - 7 - 53}} \\ {\purple{3x = - 60}} \\ {\purple{3x \div 3 = - 60 \div 3}} \\ {\purple{x = - 60 \div 3}} \\ {\purple{x = - 20}}$

B-

${\purple{14x - 8 = - 6x + 42}} \\ {\purple{14x - 8 + 6x = - 6x + 42 + 6x}} \\ {\purple{14x - 8 + 6 x = 42}} \\ {\purple{14x - 8 + 6x + 8 = 42 + 8}} \\ {\purple{14x + 6x = 42 + 8}} \\ {\purple{20x = 42 + 8}} \\ {\purple{20x =50 }} \\ {\purple{20x \div 20 = 50 \div 20}} \\ {\purple{x = 50 \div 20}} \\ \\ {\purple{x = \frac{50}{20} }} \\ \\ {\purple{x = \frac{5}{2} }}$

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