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Presumably, you were asking for a step-by-step solution. Clear["Global`*"] WolframAlpha["solve 2 x+y == 152 and x+2 y == 100"]


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Alternatively to @Roman's answer use NSolve with contrainted parameter r NSolve[{(a*(a + 3)*(a*(r - 9) + (7 - r)))/12 == (b*(3 + b*(-5 + r) - r))/7, 1 <= a <= 10000,1 <= b <= 10000, 100 < r}, {r, a, b}, PositiveIntegers] (*{{r -> 125, a -> 5, b -> 10}, {r -> 9786, a -> 117, b -> 975}}*) Without the restrictions 1 <= a &...


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