7(10+x)=21

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Solution for 7(10+x)=21 equation: 


x in (-oo:+oo)

7*(x+10) = 21 // - 21

7*(x+10)-21 = 0

7*(x+10)-21 = 0

7*x+49 = 0

7*x+49 = 0

7*x+49 = 0 // - 49

7*x = -49 // : 7

x = -49/7

x = -7

x = -7

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