Решите уравнения: х+(90+30)=180,(х+90)+30=180,(х+60)*5=500,5*х+300=500

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х+(90+30)=180x + 120 = 180x = 180 - 120x = 6060 + (90 + 30) = 180180 = 180(x + 90) + 30 = 180x = 180 - 90 - 30x = 60(60 + 90) + 30 = 180180 = 180(x + 60) *5 = 5005x + 300 = 5005x = 500 - 3005x = 200x = 200 : 5x = 40(40 + 60) * 5 = 500500 = 5005*x + 300 = 5005x + 300 = 5005x = 500 - 3005x = 200x = 200 :5 x = 405 * 40 + 300 = 500500=500